Intersection Normally Under Local Controller Patents (Class 340/916)
  • Patent number: 7408479
    Abstract: A traffic detection and signal system for pathways within an industrial work environment and method therefor includes at least one sensor positioned to detect objects approaching a pathway intersection and at least one visual indicator electronically linked to the at least one sensor to visually indicate that an object is approaching. The system further includes a controller electronically coupled to the at least one sensor and visual indicator to receive a signal that an object is approaching a pathway intersection and transmit a signal to energize the at least one visual indicator.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: August 5, 2008
    Assignee: Door-Man Manufacturing Company
    Inventor: Andrew P. Johnson
  • Patent number: 7409286
    Abstract: A process to interchange the “stop and go” driving behaviour of the traffic with a “stop and wait, then go later without stopping” driving behaviour, consisting on a partitioning of the congested route in segments through pre-installed stop and go signals marking the limit of segments to give a stop to the vehicles of the first part and later another stop to the vehicles of the second part of the divided congestion and so on, to permit the liberation of the front conflict part of the way, turning the first signal to go at the appropriate moment and then turning the second signal to go and so forth until the vehicles of every segment after waiting in standstill go without stopping re-stabilizing the normal traffic flow. The waiting time will be announced simultaneously to avoid the uncertainty of waiting time.
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: August 5, 2008
    Inventor: Jorge Osvaldo Ambort
  • Patent number: 7397390
    Abstract: A wireless traffic control system and method for wirelessly communicating information using traffic control signs are provided. The method includes wirelessly transmitting at least one of traffic control information and vehicle information from a traffic control sign and wirelessly receiving the information transmitted from the traffic control sign by at least one other traffic control sign.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: July 8, 2008
    Assignee: M/A-COM, Inc.
    Inventor: Gerald Charles DiPiazza
  • Patent number: 7327281
    Abstract: A traffic signal with integrated sensors. The present invention provides an apparatus for integrating sensors with a traffic signal. A signal case has a housing and a light source placed within the housing. A door attached to the housing is configured such that photons generated by the light may be sensed outside the housing. A tab is attached to the door. A sensor is attached to the tab. The housing or the door is adapted to allow the sensor to sense a parameter originating from outside the housing.
    Type: Grant
    Filed: August 24, 2005
    Date of Patent: February 5, 2008
    Assignee: M & K Hutchison Investments, LP
    Inventor: Michael Cole Hutchison
  • Patent number: 7274306
    Abstract: A smart traffic control device transmits information to approaching vehicles regarding its current and future state enabling vehicles to control their speed to avoid arriving at the traffic control device until it permits the passage of traffic, thus avoiding stopping, idling and reaccelerating when reaching the traffic control device. In other embodiments the traffic control device or systems receives information from vehicles, transmitting it to other vehicles.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: September 25, 2007
    Inventor: Mark W. Publicover
  • Patent number: 7098806
    Abstract: A traffic preemption system is described that includes onboard equipment located on a vehicle and a fleet management center in communication with the onboard equipment. The fleet management center is also in communication with a traffic management center that is in communication with at least one intersection controller, which controls the signals displayed at a traffic intersection. In one embodiment, the invention includes a vehicle equipped with an onboard computer system capable of capturing diagnostic information, estimating the location of the emergency vehicle using information provided by a GPS receiver connected to the onboard computer system and transmitting the captured diagnostic information and estimated location using a wireless transmitter connected to the onboard computer system via a first wireless network.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: August 29, 2006
    Assignee: California Institute of Technology
    Inventor: Aaron D. Bachelder
  • Patent number: 7057529
    Abstract: An LED traffic signal having a single switching power supply placed inside the load switch to supply power to each of the aspect signals. The traffic signal has several aspects, such as red, yellow and green. The load switch comprises a switching power supply to supply power to the signals, an output selection circuit to select the desired aspect, and a conflict monitor interface circuit to mimic an incandescent circuit.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: June 6, 2006
    Assignee: GELcore LLC
    Inventor: Jean Simon Bourgault
  • Patent number: 6985090
    Abstract: A method and arrangement for controlling a system of multiple traffic signals for regulating the traffic of vehicles is described. Traffic data is transmitted by wireless transmission to traffic data processing units assigned individually to a locally limited group of traffic signals, and each traffic data processing unit performs an analysis of the local traffic situation for the environment of the locally limited group of traffic signals up to, at the maximum, the neighboring locally limited groups of traffic signals.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: January 10, 2006
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andre Ebner, Matthias Lott, Egon Schulz, Ruediger Halfmann, Hermann Rohling
  • Patent number: 6940422
    Abstract: An emergency vehicle traffic light preemption system for preemption of traffic lights at an intersection to allow safe passage of emergency vehicles. The system includes a real-time status monitor of an intersection which is relayed to a communications controller for transmission to emergency vehicles as well as to a central dispatch office. The system also provides for audio warnings at an intersection to protect pedestrians who may not be in a position to see visual warnings or for various reasons cannot hear the approach of emergency vehicles. A transponder mounted on an emergency vehicle provides autonomous control so the vehicle operator can attend to getting to an emergency and not be concerned with the operation of the system. Activation of a Code 3 situation provides communications with each intersection being approached by an emergency vehicle and indicates whether the intersection is preempted or if there is any conflict with other approaching emergency vehicles.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: September 6, 2005
    Assignee: California Institute of Technology
    Inventors: Aaron D. Bachelder, Conrad F. Foster
  • Patent number: 6937161
    Abstract: In traffic signal control for setting a green light time to a value between the lower limit time and the upper limit time in real time depending on a traffic volume sensed by vehicle sensors Sa, Sb, and so forth, the upper limit time Gmax is set longer with an increase of a traffic volume on an access road corresponding to a phase in question (Steps T8 and T9). This arrangement is effective for use at an intersection where a traffic volume in one direction is far heavier than in any other direction, and thereby makes it possible to forestall the occurrence of traffic jam (FIG. 6).
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: August 30, 2005
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Shigeki Nishimura
  • Patent number: 6919823
    Abstract: An image recording apparatus is disclosed for recording traffic signal violations such as a traffic light signal changing to a red light. The apparatus includes a capturing unit for capturing a first image substantially at an instant of time that a control signal changes its status and a storing unit for storing the first image at least temporarily. The apparatus includes a detecting unit for detecting presence of a vehicle or object beyond a location at which the vehicle or object is required to stop in response to the change in status and a device responsive to the detecting unit for recording a first image in the event that the detecting unit detects presence of the vehicle or object beyond the location. The apparatus may include a deleting unit for deleting the first image in the event that the detecting unit does not detect presence of the vehicle or object beyond the location.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: July 19, 2005
    Assignee: Redflex Traffic Systems Pty Ltd
    Inventor: Roy William Lock
  • Patent number: 6870489
    Abstract: A reusable mechanical fastening means for a vehicle monitoring system facilitates maintenance and repair of the system. A plurality of carrier sections are connected together by clips. The clips have release tabs to move prongs against a spring force, thereby making the clips manually detachable. Vehicle sensing probes have interference ridges which mate with probe openings in the carrier sections. The carrier sections have open bottoms, and the worker can overcome the locking force of the interference ridge by turning the carrier section over and pressing on the probe through the open bottom. The clips can be attached on multiple planes relative to the carrier sections, minimizing torsional play within the extended support train. The clips and carrier sections are also easily manufacturable.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: March 22, 2005
    Assignee: 3M Innovative Properties Company
    Inventor: Eric R. Cybulski
  • Patent number: 6710722
    Abstract: A traffic light control and information transmission device compromising a microprocessor on the cross road, the microprocessor further connects to a traffic light controller, an electronic display board, a video camera, a compression circuitry, an I/O interface, a traffic flow detector and connected to the central traffic control computer through the DSL (Digital Subscriber Loop). The control signals, traffic, public information or news of the central traffic control computer can go through the DLS to the microprocessor; the microprocessor can control the traffic light and display all the information on the electronic display board. The traffic flow data of the cross roads can be accessed by the traffic flow detector and the video camera and transmitted back to the central traffic control computer.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: March 23, 2004
    Inventor: Hsi-Che Lee
  • Patent number: 6532415
    Abstract: A sightseeing guide system has IS (Informed Source) terminals respectively mounted in an IS vehicle, which includes a sub-storage unit stored with local information consisting of sightseeing information and shop information, a radio communication device for performing IVC-based communications with a PT (Personal Terminal) vehicle, and a processing unit. A personal terminal (PT) mounted in the PT vehicle includes a radio communication device for performing the IVC-based communications with the IS terminal, a processing unit, and an I/O unit for displaying the information received via the radio communication device. The processing unit of the IS terminal transmits segments about a periphery of a present position of the IS vehicle, of the local information stored in the sub-storage unit, to the PT via the radio communication device at a predetermined timing or in response to a request give from the PT.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: March 11, 2003
    Assignee: Fujitsu Limited
    Inventor: Kumiko Nishikawa
  • Patent number: 6392563
    Abstract: A traffic light backup system for use with a traffic light is described. The traffic light backup system includes an auxiliary light associated with at least one of the enclosure housing the traffic lights and rechargeable batteries associated with the auxiliary light. A power failure is detected by monitoring the voltage across the bulbs of the traffic lights and also preferably by monitoring the current in the common, neutral lead. When a power failure has been detected, the traffic light backup system engages and the auxiliary light is powered by the rechargeable batteries, preferably in a flashing fashion. In a preferred embodiment, the auxiliary light consists of a plurality of LEDs arranged in an octagonal manner. The LEDs have a high luminosity and lower power consumption, which makes them well suited for use even in broad daylight.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: May 21, 2002
    Assignee: 9022-6523 Quebec Inc.
    Inventors: Daniel Paquette, Nicholas Krouglicof
  • Patent number: 6366219
    Abstract: An improved traffic management process and apparatus. After a camera gathers information, the system automatically extracts important information by image processing and analysis techniques. The system identifies all types of movement including pedestrians and two-wheel vehicles. The process and the apparatus first simulate and validate the strategy prior to its on-site implementation.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: April 2, 2002
    Inventor: Bouchaib Hoummady
  • Patent number: 6281808
    Abstract: A collision avoidance system and method for a traffic intersection having a traffic light, which selectively extends the duration of a red light cycle to prevent traffic from entering the intersection during a red light violation. Output from one or more violation prediction image capturing devices is used to provide images showing one or more vehicles approaching the intersection. A violation prediction unit, which is also coupled to a signal reflecting a current light phase of the first traffic signal, receives and processes vehicle location information derived from the images to generate violation predictions for the vehicles approaching the intersection. The violation prediction indicates a likelihood that an associated vehicle will violate an upcoming red light phase of the traffic signal. In response to the violation prediction, a violation predicted signal is provided to a traffic signal controlling traffic intersecting with the predicted violator.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: August 28, 2001
    Assignee: Nestor, Inc.
    Inventors: Michael T. Glier, Mark D. Laird, Michael T. Tinnemeier, Steven I. Small, Randall T. Sybel, Douglas L. Reilly
  • Patent number: 6262673
    Abstract: A roadway warning system includes a visual traffic directing device that is at a first status for a first status time period and that is at a second status for a second status time period. A transmitter transmits a signal for a first signal time period, and a receiver mounted on the vehicle receives the signal. An indicator connected to the receiver indicates that the visual traffic directing device is either at the first status or is about to change to the first status so that a driver of the vehicle is warned of the present or future status of the visual traffic directing device.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: July 17, 2001
    Inventor: Charleen L. Kalina
  • Patent number: 6236331
    Abstract: The LED traffic light electronic controller stabilizes the total output light intensity of the traffic light in order to ensure a constant light intensity of each traffic light color throughout the entire traffic light lifetime. The controller detects the output light intensity of a color, and then automatically adjusts the power input for the LEDs in order to increase the light intensity when needed. The controller works in a closed loop cycle in order to perform real-time control of the light intensity output. Thus, at each moment of the traffic light lifetime, the output light intensity is constant and equivalent to a predetermined standard. This insures traffic safety for the entire traffic light lifetime and also make it last longer. The controller also provides a ballast load when off, and is able to provide an open circuit when the LEDs have exhausted their useful lifespan. The intensity is further controlled by detecting ambient light conditions.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: May 22, 2001
    Assignee: Newled Technologies Inc.
    Inventor: Guy Dussureault
  • Patent number: 6198410
    Abstract: An illuminatable traffic sign including a traffic sign secured to a support post. The traffic sign has indicia disposed thereon. The traffic sign has an outer periphery. A plurality of lights are positioned on the traffic sign along the outer periphery and outlining the indicia thereof.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: March 6, 2001
    Inventors: Larry White, Dorothy White
  • Patent number: 6172617
    Abstract: An interface device between a computer running a traffic simulation program and any number of traffic signal controllers. The traffic simulation program simulates traffic in a road network including signal-controlled intersections. There are many signal manufacturers and they do not release the details of the control algorithms used in their controllers, hence it is impractical if not impossible to merely insert the control algorithm for a given controller into the program. The interface of the present invention allows any controller from any manufacturer to be used with the simulation program so that traffic flow in any network including signal-controlled intersections can be simulated. An assumed traffic network and demand traffic is input into the program; the program sends detector actuations to the signal controllers via the interface device and the controllers's phase indication states are sent back into the program also via the controller.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: January 9, 2001
    Assignee: Louisiana State University
    Inventor: Darcy M. Bullock
  • Patent number: 6087960
    Abstract: An accident sound detection circuit includes an accident sound detection block that detects an accident sound from a sound signal inputted from an environmental sound detection unit and outputs an accident sound detection signal a power spectrum calculator for obtaining a power spectrum in regard to a sound signal when acquiring the accident sound detection signal outputted from the accident sound detection block as a trigger signal, a spectrum pattern calculator for forming a pattern of the power spectrum, and a pattern comparator circuit for comparing the formed spectrum pattern and a set pattern set in a pattern generating circuit beforehand and generating a final accident sound detection signal if the patterns coincide with each other.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: July 11, 2000
    Assignee: Mitsubishi Electric Engineering Company, Limited
    Inventors: Noboru Kyouno, Makoto Koura, Toshimitsu Seri
  • Patent number: 6008741
    Abstract: An intersection information supply apparatus includes a table indicating relationships between approaching directions of a vehicle to an intersection and signal forms, an approaching direction detecting unit detecting an approaching direction in which the vehicle is approaching the intersection, a transmission unit transmitting a signal having a signal form indicated in the table so as to correspond to the approaching direction detected by the approaching direction detecting unit, a signal obtaining unit selectively obtaining, from among signals externally arriving at the vehicle, a signal having a signal form indicated in the table so as to correspond to an approaching direction relevant to the approaching direction detected by the approaching direction detecting unit and an information output unit outputting information about presence of another vehicle when the signal obtaining unit obtains the signal.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: December 28, 1999
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiko Shinagawa, Kenji Sasaki
  • Patent number: 5999877
    Abstract: A traffic flow monitor apparatus which can monitor a traffic flow at high precision over a wide range from the position near a TV camera to the distant position regardless of traffic conditions. An image analysis area crossing a road of an overlooked road image received every predetermined cycle is analyzed, the characteristic portion of the front (rear) portion of the vehicle is registered as a template, the vehicle is tracked by a pattern-matching process while updating the template, and the size of the template is reduced (enlarge) depending on a change in apparent width of a lane during template updating. Since the characteristic portion of the front (rear) portion of the vehicle is registered, and the vehicle is tracked by the pattern-matching process, no reference image of a road portion on which no vehicle exists is required, and influence of approaching or overlapping of another vehicle can be reduced. A traffic flow can be monitored at high precision regardless of deserted traffic or crowded traffic.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: December 7, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Kazuya Takahashi, Tadaaki Kitamura, Yoshiyuki Satoh
  • Patent number: 5990808
    Abstract: A traffic light remote control system comprising a plurality of traffic lights each situated at a single road intersection and having a green light, a yellow light, and a red light constituting an array of racing lights. Associated therewith is a programmable logic controller connected to each of the traffic lights of the single road intersection and adapted to flash each of the array of racing lights thereof only upon the receipt of an activation signal with an accompanying unique code associated therewith. Also included is a cellular transceiver connected to the programmable logic controller with a modem connected therebetween. The modem and cellular transceiver serve to communicate signals over a unique cellular line with a unique phone number dedicated to the plurality of traffic lights of the single intersection.
    Type: Grant
    Filed: December 4, 1997
    Date of Patent: November 23, 1999
    Inventor: Eric S. Baer
  • Patent number: 5898389
    Abstract: A system and method for automatically supplying a flashing line voltage from power stored in an auxiliary battery to power red traffic signal lamps using clusters of light emitting diodes during a blackout condition. A plurality of flash block connectors are pin-to-pin compatible with the flash block jumper blocks of an already installed traffic light control system so that the existing system is retrofitted without any cabinet or field rewiring or any cutting or crimping of the wires.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: April 27, 1999
    Assignee: Electro-Tech's
    Inventors: Raymond E. Deese, Carl B. Henderson, Timothy W. Connolly
  • Patent number: 5822711
    Abstract: An autonomous controller includes a microprocessor, a programmable memory for storing a plurality of cycle structures, a clock/calendar circuit accurate to within a few seconds per month, a lamp driver including a plurality of isolated outputs for operating traffic signals, a display driver for providing a indication of optimum speed through the controlled intersection, and an I/O device coupled between the microprocessor and an external connector for downloading the cycle structures to the programmable memory. The microprocessor reads data from the programmable memory, selects a cycle structure suitable for the time of day, and causes the lamp driver to control the traffic signals in an intersection in accordance with the selected cycle structure.
    Type: Grant
    Filed: November 20, 1995
    Date of Patent: October 13, 1998
    Inventor: Fernando Ochoa-Chavez
  • Patent number: 5805081
    Abstract: A portable signal for traffic control at intersections, school crossings, traffic accidents, road repairs, and road construction. In the first aspect of the invention, the signal is suspended from an overhead cable which supports an existing traffic signal. The signal is formed by attaching one or more detachable light panels to the sides of a control module. Each light panel is comprised of a rectangular housing and a vertical array of red, amber and green lights mounted in the housing. The control module is a generally rectangular unit comprised of a housing and controls, timing circuits and a power supply mounted in the housing. The timing circuits are conventional and control the "on" and "off" periods of the red, amber and green lights. A remotely controlled power hoist is attached to the top of the control module for raising and lowering the traffic signal. In a second aspect of the invention, the traffic signal is supported on a vertical post which rests on a road surface.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: September 8, 1998
    Inventor: Karel John Fikacek
  • Patent number: 5717391
    Abstract: A system for determining the condition of a traffic controlling semaphore has an audio sensor mounted in the vicinity of an intersection so the sound level is monitored at all times. A computer is placed into the semaphore controller, and the computer receives the audio signal, a time signal, and a signal representing the status of the semaphore. When a sound is detected above a certain minimum level, which is above the usual traffic noise, a record is generated by the computer, and recorded in permanent form, perhaps printed on paper. The record includes the date, time, and status of the semaphore.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: February 10, 1998
    Inventor: Otto M. Rodriguez
  • Patent number: 5710555
    Abstract: A improved siren detector for detecting siren sounds which precess at known warble rates, such as yelp, wail, and high-low, within a selected frequency band. A transducer detects the siren sounds and produces a corresponding electrical output signal. This electrical output signal is filtered to reject signals outside of the selected siren frequency band. The signal is processed to determine the amplitude of the electrical signal, and hence the sound level of the siren sound at the transducer input. This signal is also processed by an amplitude limiter and frequency discriminator to determine the instantaneous frequency of the siren sound. This discriminator is followed by a non-linear filter to remove the FM clicks characteristic of siren sounds having a low signal to noise ratio. Selection filters are used to analyze the precession rates, maximum frequency, minimum frequency, and shape of the precession characteristic to classify the siren as to its type, such as yelp, wail, and high-low.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: January 20, 1998
    Assignee: Sonic Systems Corporation
    Inventors: Peter Robert Henderson McConnell, Patricia Fern Kavanagh
  • Patent number: 5663719
    Abstract: The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to control traffic at a highway intersection. The voltage compensation circuit achieves these objectives without substantially increasing the power consumption, overall cost, or failure rate of the LED traffic signal light. In the preferred embodiment, the voltage compensation circuit disables or rearranges a first and then a second set of LEDs in the traffic light, as the input power voltage drops below a first and then a second threshold voltage, so that the remaining LEDs will be driven by an increased current and generate a greater overall light intensity than if all of the LEDs were driven by the decreased current that would result from the decreased input power voltage.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: September 2, 1997
    Assignee: Electro-Tech's
    Inventors: Raymond E. Deese, David D. Lewis
  • Patent number: 5659305
    Abstract: An backup vehicular traffic control system employs a connector-switch including a normally-closed electrical switch connected in series between a traffic signal and a primary control system. In the event of an emergency condition, such as a failure of the primary control system and/or failure of a primary power source, or in the event of a shutdown condition, such as a shutdown of the primary control system and/or shutdown of the primary power source, a connector is manually connected to the connector-switch. The normally-closed electrical switch is opened when the connector is connected to the connector-switch, disconnecting the primary control system from the traffic signal. Also upon the connection of the connector to the connector-switch, an auxiliary control system coupled to the connector is coupled through the connector and connector-switch to the traffic signal. After being connected, the auxiliary control system assumes control of the time of operation of the traffic signal.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: August 19, 1997
    Assignee: Science Applications International Corporation
    Inventors: Jack C. Rains, Richard W. Sutton
  • Patent number: 5633629
    Abstract: A traffic information system (10) including a road (12), a vehicle (14) traveling on the road (12) and a traffic light assembly (16) operatively associated with the road (12) is disclosed. The system (10) includes a traffic light assembly (16) comprising at least one traffic light or lamp means (18). The traffic light (18) includes a plurality of light emitting diodes (24) for projecting light rays to the vehicle (14) to provide the driver of the vehicle (14) with a visual signal. The system (10) further comprises a transmitter (20) including a power supply (30) and a modulator (72) for turning the diodes (24) on and off at a rate that is imperceivable to humans while optically transmitting information to a receiver (22) disposed on the vehicle (14).
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: May 27, 1997
    Inventor: Peter A. Hochstein
  • Patent number: 5619194
    Abstract: The system includes a high-intensity light source, a fiber optic conduit for transmitting a light-beam, and colored lenses, which emit red, yellow, and green light on fiber optic lines. Each traffic light has a shutter and control means for opening and closing the shutters in the proper sequence for preset time periods to control red, yellow, and green lights.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: April 8, 1997
    Inventor: Bruce D. Belfer
  • Patent number: 5610599
    Abstract: A system for traffic signals for one-side passing, which realizes efficient traffic control during abnormal operation of detectors or the night with little traffic density. Traffic signals 6 and 7 are provided with detectors 8 and 9 for detection of passing of vehicles respectively. Both traffic signals repeat traffic lighting in a cycled manner such as green-red, red-red, red-green and red-red by a sensitive controller 10. Owing to an ill-detection switching device 71, if there is no detection signal input by the detector of one traffic signal within a switch holding time after detection signal is input by the detector of the other traffic signal, the green lighting of one traffic signal will be shifted to a fixed-cycle operation until detection signal input by the detector. The traffic signal shifted to the fixed-cycle operation will be restored to the sensitive operation if the detection signal is input by the detector.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: March 11, 1997
    Assignee: Nihon Samicon Co. Ltd.
    Inventors: Toshimitsu Nomura, Akira Sato, Minoru Ishizaki, Kaoru Takeda, Kazuhiko Yasui
  • Patent number: 5457450
    Abstract: The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to control traffic at a highway intersection. The voltage compensation circuit achieves these objectives without substantially increasing the power consumption, overall cost, or failure rate of the LED traffic signal light. In the preferred embodiment, the voltage compensation circuit disables or rearranges a first and then a second set of LEDs in the traffic light, as the input power voltage drops below a first and then a second threshold voltage, so that the remaining LEDs will be driven by an increased current and generate a greater overall light intensity than if all of the LEDs were driven by the decreased current that would result from the decreased input power voltage.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: October 10, 1995
    Assignee: R & M Deese Inc.
    Inventors: Raymond E. Deese, David D. Lewis
  • Patent number: 5444442
    Abstract: A method for predicting a traffic flow rate at a point on a road to control a traffic light signaling system measures a traffic density on the road to predict a traffic flow rate by utilizing the fact that a velocity of a vehicle on the road is restricted by an interval between successive vehicles, since the traffic density is locally increased when the vehicle interval is not uniform and therefore the spatial mean speed is lowered. This method offers higher accuracy by utilizing a correction coefficient obtained from an actual vehicle distribution, for instance, a coefficient derived from entropy.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: August 22, 1995
    Assignees: Matsushita Electric Industrial Co., Ltd., Tokai University Educational System
    Inventors: Mareo Sadakata, Yoichiro Iwasaki, Yoshiharu Yano, Masakazu Toyama
  • Patent number: 5408232
    Abstract: A traffic signal device having a single, continuously-illuminating lamp and several plain reflectors constructed by optical thin film technique to receive the light beam projected from the lamp and respectively reflecting light components of pre-determined wavelengths to display differently-colored traffic signals. Also, is a lamp detection system which monitors and detects the operation of the lamp and generates a signal to actuate the lamp interchanging mechanism to automatically replace the lamp with a spare lamp once the lamp malfunctions.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: April 18, 1995
    Assignee: Industrial Technology Research Institute
    Inventors: Rung-Ywan Tsai, Chaur-Tsang Wei, Chii-Hua Lee, Fang-Chuan Ho
  • Patent number: 5387908
    Abstract: A traffic control system 10 is provided having an illuminating member 42 and a rotating drum 48. The drum 48 is provided with a red reflector 50, a green reflector 52 and a yellow reflector 54 formed on different portions thereof. A control channel 14 is provided for selectively rotating the drum 48 so that each reflector 50, 52 and 54 can be illuminated by the illuminating member 42 thus providing an indication whether a vehicle should stop, go or exercise caution. The traffic control system 10 is also provided with a monitoring channel 16 which monitors the control channel 14 to insure the circuit is operating properly.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: February 7, 1995
    Inventors: Edgeton Henry, Fitz Jackson
  • Patent number: 5357436
    Abstract: A traffic signal network is controlled by an adaptive, fuzzy logic based, distributed system of microprocessors. The system can control multiple intersections in a network of two-way streets. Traffic signal timing at each intersection is be defined by signal control parameters such as cycle time, phase split, and offset time. Local traffic flow data is input to each microprocessor and characterized by membership functions. Fuzzy logic decision rules are applied to the characterized data and used to adjust the signal control parameters at each intersection as a function of the local traffic conditions and the signal parameters in effect at neighboring intersections. Cycle time is adjusted to maintain a good degree of saturation, and phase split is adjusted to achieve similar degrees of saturation on competing approaches. The offset time at each intersection is coordinated with the neighboring intersections and adjusted gradually to optimize traffic flow in the dominant direction.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: October 18, 1994
    Assignee: Rockwell International Corporation
    Inventor: Stephen L. Chiu
  • Patent number: 5327123
    Abstract: A traffic control system for use at a roadway intersection, the system including traffic control lights, a light flasher structure, and a plurality of load switches electrically coupled with the lights via relay structure to which the flasher structure is connected, the load switches having inputs, and a controller connected with the load switches for controlling normal operation of the lights and flashing of one or more of the lights by the flasher structure in the event of a system malfunction comprising a microprocessor operatively connected with the load switches, flasher, and relay structure to monitor the system for detecting a malfunction event, for recording the detected malfunction event, and for transmitting the malfunction detection to another location; and verification structure at the other locations for i) receiving the transmitted malfunction detection, ii) verifying the event, and iii) initiating malfunction corrective action; whereby the corrective action in the system may be initiated withou
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: July 5, 1994
    Assignee: Traffic Sensor Corporation
    Inventors: Kenneth R. Heimann, Hien T. Chu
  • Patent number: 5208584
    Abstract: A traffic controller system to be utilized as a primary or a back-up unit capable of operating both with an A.C. or a D.C. power supply. The apparatus utilizes a single timing capacitor and an array of timing resistors to generate all timing information for the operation of a traffic light.
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: May 4, 1993
    Inventors: Jonathan Kaye, Albert Briffa
  • Patent number: 4908616
    Abstract: A system for controlling traffic at a street intersection includes an intersection signal light assembly with a flashing green signal light unit, in addition to the usual red, yellow and green signal light units. A signal controller is provided for the intersection signal light assembly and actuates the flashing green signal light unit during flashing green intervals that precede green intervals in which the green signal light unit of the intersection signal light assembly is actuated. A pre-intersection signal light assembly is located in proximity to a reaction point associated with an approach lane to the intersection. The distance that the reaction point is located from the intersection is determined by considering the reaction time of a driver and the stopping distance of a vehicle in which the vehicle could be safely brought to a stop at the intersection.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: March 13, 1990
    Inventor: Jonothan P. Walker
  • Patent number: 4847618
    Abstract: A traffic control system for controlling vehicular traffic flow at intersections in which the conventional red, yellow, green three light traffic signal that informs a motorist to stop, prepare to stop, and go is supplemented by an auxiliary signal spaced from the intersection. The auxiliary signal informs a motorist that he will have sufficient time to make a gradual normal stop at the intersection before the red stop light is switched on, provided he has not passed the auxiliary signal when the yellow light of the traffic signal is illuminated. If he has passed the auxiliary signal when the yellow light of the traffic signal is switched on, he will know that he can proceed through the intersection before the red stop light is switched on. The auxiliary signal may be a single or double yellow light operating in synchronism with the yellow light of the traffic signal, or it may be another type of signal, such as a painted zone on the roadway surface.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: July 11, 1989
    Inventor: Estelle Baustin
  • Patent number: 4590455
    Abstract: A traffic control system is provided wherein the green and/or red signal lights are blinked momentarily at a predetermined interval before the direction of traffic is changed, and wherein a marker is placed along the roadway at a normal distance of travel within the timing of the blink signal to enable motorists to gauge their driving to save gasoline and achieve greater safety solely by noting their location relative to the marker when the blink signal occurs. Further, the invention relates to the use of this traffic signalling system in connection with a semi-actuated controller having a synchrolizer providing a background cycle, wherein the timing of the blink signal and the yellow caution signal is obtained from the synchrolizer. A specific feature resides in a novel means to prevent the synchrolizer from triggering a change in direction of traffic without a prior actuation of the blink signal.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: May 20, 1986
    Inventor: George H. Fritzinger
  • Patent number: 4481515
    Abstract: A coordinator for a traffic signal controller having a motor and associated switching system for establishing the duty and width cycle of the controller. The controller being connected, via electrical circuitry, to an AC power grid. The coordinator is a self-contained unit arranged for connection to the controller to effect coordination thereof by producing timing signals in response to receipt of either AC signals from the electrical circuitry or stray AC radiation from adjacent sections of the power grid. The coordinator also includes an independent oscillator for producing independent timing signals. Thus, the coordinator can maintain coordination of the controller under normal operating conditions or under the abnormal operating conditions of a local power failure or a general power failure.
    Type: Grant
    Filed: April 1, 1982
    Date of Patent: November 6, 1984
    Assignee: Philmont Electronics, Inc.
    Inventors: James A. Benson, Amadio D. Buccini
  • Patent number: 4472714
    Abstract: A device used in the control of automobile traffic signal systems for maintaining a local time reference during periods when the a.c. power is interrupted. An accurate oscillator such as a crystal controlled oscillator is used to provide a local time reference during power interruptions. The device maintains a local clock in synchronism with the a.c. power when the power is present and maintains the time reference in synchronism with the crystal oscillator during those periods when the a.c. power is absent. Pulse trains at different rates generated in synchronism with the oscillator are combined to achieve these objects.
    Type: Grant
    Filed: January 21, 1983
    Date of Patent: September 18, 1984
    Assignee: Econolite Control Products, Inc.
    Inventor: Wilbur E. Johnson
  • Patent number: 4463339
    Abstract: Traffic signals at an intersection are controlled by one or more controllers of the state/interval type, located in the vicinity of the intersection. One or more remote units that are portable or mobile communicate with the controller via a coded signal to command specific light operations, instruct a secondary controller to take-over light control at the intersection from a primary controller, and to reprogram the operation of the controller on a temporary or permanent basis. The remote units generate a code that must be received accurately by the controller before commands are followed. In order to economically provide such a code, the code generator employs a diode matrix that orders data words and address words and is easily reprogrammed. The traffic signal indicator operation is monitored by the controller both to detect controller error, as by a voltage error resulting from an incorrect controller action, and to detect a non-controller error, as by a current error resulting from a burned out indicator.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: July 31, 1984
    Assignee: Ralph E. Frick
    Inventors: Ralph E. Frick, Nelson E. McNulty
  • Patent number: 4462031
    Abstract: A synchronization device for the control of an automobile traffic signal in synchronization with other traffic signals in the system. A present time clock in the device operates from the local alternating current power source. The synchronization device calculates the time difference between the present time and a daily re-synchronization time, divides that time difference by the length of the operating cycle of traffic signal, and generates a synchronization pulse whenever the residue of the division is zero. An offset or time-delay is added to the synchronization pulse and the traffic signal is operated in response to the delayed synchronization pulse so as to operate with the desired time delay in coordination with the other signals in the system.
    Type: Grant
    Filed: January 21, 1983
    Date of Patent: July 24, 1984
    Assignee: Econolite Control Products, Inc.
    Inventor: Wilbur E. Johnson
  • Patent number: 4449116
    Abstract: In a digital pretimed traffic controller of the type used to control traffic signals at an intersection during a selected signal cycle there is provided an improvement wherein a demand signal, such as created by a detector, is directed to the controller. The demand signal is used for selecting one of a plurality of interval sequences within a fixed time cycle background. In this manner, the digital pretimed controller is compatible with electro-mechanical controllers and still retains traffic actuation versatility. The controller also is constructed to assure that the overall cycle length and the programmable individual interval times are identical before the particular timing plan can be accepted by the controller.
    Type: Grant
    Filed: December 1, 1981
    Date of Patent: May 15, 1984
    Assignee: Gulf & Western Manufacturing Company
    Inventors: Frank W. Hill, William L. May, Willard L. Kent