Abstract: An apparatus and method for providing an automated back-up alarm on a mobile machine including a back-up detector to detect enablement of rearward motion by the mobile machine, a visual indicator, an audible indicator, and a controller. The apparatus detects enablement of rearward motion by the mobile machine and a parameter representative of ambient light, and responsively activates one of the visual indicator and the audible indicator as a function of the mobile machine being enabled to move in a rearward direction and the parameter representative of ambient light.

Abstract: A passive warning system for communicating vehicular deceleration and other information through a warning light. A microprocessor-based warning system according to the invention accounts for variations in vehicular speed and ambient driving conditions in generating a warning signal having an intensity or blinking rate related to a rate of deceleration. The microprocessor is also programmed to measure deceleration more frequently as the speed of the vehicle increases, allowing information to be communicated in a timely manner. In one embodiment of the invention, the microprocessor is programmed to maintain the highest intensity warning signal activated for a predetermined period of time in order to inform other vehicles of an earlier speed reduction. Further, a warning system according to the invention can be configured to communicate a high intensity warning signal if the wheels of the vehicle become suddenly blocked or rotate at a rate that is disproportionate to the speed of the vehicle.

Abstract: An intelligent strobe system for vehicle applications includes strobe modules connected between the positive and negative DC power rails of the vehicle. One of the strobe modules includes a transmitter circuit for generating sinusoidal data and transmitting the data over the DC power rails. Other strobe modules include a receiver circuit to receive and decode the sinusoidal data to control the flash sequence.

Abstract: The invention comprises a vehicular wide turn warning device having a placard with a warning printed thereon. The placard also has mounted thereon a strobe lamp and a plurality of light-emitting mechanisms, the light-emitting mechanisms being arranged to form an arrow having a point and a tail. The invention also comprises a control circuit for operating the light-emitting mechanisms and strobe lamp mounted upon the placard. The control circuit is arranged such that the light-emitting mechanisms forming the arrow are sequentially and cyclically illuminated beginning with the light-emitting mechanisms forming the tail of the arrow and preceding to the light-emitting mechanisms forming the head of the arrow. The strobe lamp is cyclically illuminated in conjunction with the light-emitting mechanisms forming the arrow. A manually operable switching means located adjacent a driver of a vehicle activates a control circuit for the vehicular wide turn warning device.

Abstract: A vehicle warning and help apparatus and method comprising a light box electrically and removably connected to a control panel. The light box comprises a red light, yellow light, transceiver, power supply, inertial switch, and momentary contact switch. The control panel comprises a continuous yellow switch backlit when ON by a continuous yellow switch light, a three-flash yellow switch backlit when ON by a three-flash yellow switch light, a red switch backlit when ON by a red switch light, and a horn. In operation, a transmitting vehicle warning and help apparatus sends a signal on a red frequency, a yellow frequency, or both. The transmissions are received by a receiving vehicle warning and help apparatus, and the receiving vehicle warning and help apparatus sounds its horn and illuminates a combination of its continuous yellow switch light, three-flash yellow switch light and red switch light, thus communicating a condition of maximum alert, minimum alert, momentary warning, or official alert.

Abstract: A light bar for mounting on an emergency vehicle has a modular construction using trays for mounting lights. The trays are integral members having cells formed therein for receiving components of light fixtures. The light bar has two lighting tiers. The lights on the lower tier are received in the cells of the trays. The tops of the trays provide a platform for mounting lights on the upper tier. Alternatively, the upper-tier lights may be mounted on the upper shell of the housing of the light bar. Snap-fit fasteners are formed on the trays for mounting components of the lights. In one configuration, the light bar includes a speaker which has a driver mounted inside the light bar housing and a horn which fits in an opening in the housing and is coupled to the driver for transmitting audio signals.

Abstract: A road safety system for vehicles employing built-in driving information, wherein it regards the conduct adopted by drivers when driving their vehicles as being manifested in the displacement of the accelerator pedal by pressure thereon, that having gathered this information and the indication of the normal/fog selector, it is conveyed to the position detector, and the output therefrom through a linking cable to the receiving module so as to illuminate an elongate luminous strip, installed in the rear part of the vehicle, so as to be visible to other drivers under the criteria which define the manner in which to illuminate, for the fully depressed or raised positions of the pedal, the whole of the green or red strip respectively, for intermediate positions, green and red patches, green indicating the proportional displacement of the pedal and red the difference to make up the strip.

Abstract: A lighting system and method for broadcasting colored lights as emergency warning signals from a light source. A centralized continuous light source is coupled via a fiber optic transmission medium to an external display location such as a lens or the like located on a vehicle. The color and the relative intensity of each color is periodically modulated to alternate between at least two states such that the contrast between these alternating states is perceived by observers to be a flashing source of light with no off-time. The frequency and the duty cycle of the repetition rate of alternating between the states may be further controlled to better draw attention to the light source.

Abstract: A flashing motorcycle brake light enhancement system including a plurality of super bright light emitting diode (LED) modules which signal the driver of a following vehicle to slow down to avoid a rear-end collision. The application of the motorcycle's brake supplies input current to a plurality of (LED) modules via a flasher unit and connected wiring. The flashing circuit is controlled by a single, blinking light emitting diode, which is operated in combination with a resistor matched to a relay coil, to actuate a mechanical relay, which passes full battery voltage to the (LED) modules. In one embodiment the flashing (LED) modules are contained within weather-resistant housings which are attached in symmetrical arrangement and externally of the rear-mounted motorcycle brake light housing.

Abstract: A van rear door light display having reflectors for impinging light from headlights of approaching traffic, which reflectors are positioned rearwardly when the doors are opened, as when the van is loaded and unloaded, and are strategically at different heights on the edges of the doors to obviate contact therebetween when the doors are closed.

Abstract: A warning light is integrated with a fixed position, externally mounted rear-view mirror, the warning light having a housing which forms an aerodynamically contoured extension of the mirror. A light head is received by the housing such that, when the housing is engaged by the rear-view mirror, the light head assembly means generally faces towards the front of the vehicle.

Abstract: Taillights are located adjacent the hinge axis of, and on van right and left doors, so that a closed door displays the taillight to traffic approaching the van from the rear. Also after a door pivotal traverse into an open condition there is a display of the taillight to traffic approaching the van from the front.

Abstract: A method and an electronic circuit are for monitoring the operation of a circuit including a plurality of intermittently powered parallel load elements, such as the flasher lamps of a vehicle. The total load current is directed through a measuring shunt resistor, and the resulting voltage across the shunt is measured and evaluated. The measured voltage initially arising across the shunt is used as a basis to establish a first voltage level for a load failure control threshold. A second voltage level greater than the first voltage level is established as a short-circuit control threshold. Then, the voltage value arising across the shunt during operation of the circuit is compared to the load failure control threshold and the short-circuit control threshold, and a load failure or a short-circuit is detected dependent upon and responsive to the result of these comparisons.

Abstract: An operations vehicle with a lighting device for a working area extending from a side panel, a roof, or both, at least in the direction opposite the operations vehicle. The lighting device is arranged in the transition region between the side panel and the roof of the operations vehicle. In the transition region at least between a side panel and the roof of an operations vehicle is arranged a dropside-like boundary element which is placed on the roof and projects beyond it in a more or less perpendicular direction. On the boundary element is arranged a light source, in particular a fluorescent tube, in a lining which in the direction of the side panel of the operations vehicle and if occasion arises in the direction pointing away from it comprises openings for passage of light, preferably sealed by a light-transmitting lining panel.

Abstract: A moveable traffic turn indicator may be constructed with a first elongate member exhibiting a first major surface terminated by a first end, a second elongate member exhibiting a second major surface terminated, a hinge pivotably joining the second elongate member to the first elongate member, and a double acting actuator coupled between the first elongate member and the second elongate member to drive the second elongate member between a retracted position with the second major surface in juxtaposition alongside the first major surface and a deployed position with the second major surface obliquely oriented relative to the first major surface to fully expose indicia borne by the second major surface.

Abstract: A motor vehicle warning signal light assembly is installed within a car and near a back window, which includes stop signal light, an invertedly disposed V-shaped signal light, a control switch, a leftward turn signal light, and a rightward turn signal light. The stop signal light is synchronously operated with the stop lights of the motor vehicle. The invertedly disposed V-shaped signal light and the stop signal light form a triangle signal light, which can be manually turned on by the control switch. The leftward turn signal light and the rightward turn signal light of the assembly are respectively operated with the leftward turn signal light and rightward turn signal light of the motor vehicle.

Abstract: A taxi cab emergency signal including an emergency light situated on a roof of a taxi cab. The emergency light adapted to create a visual signal upon the receipt of power. Further included is an emergency switch discretely situated within the taxi cab adjacent a driver thereof and electrically connected between a power source and the emergency light for allowing the supply of power thereto upon the actuation thereof.

Abstract: A vehicle warning system controller is disclosed which controls and synchronizes all annunciators installed on a vehicle. The vehicle light control system takes a modular approach to vehicle light control. The first module is an operator module that accepts control commands from an operator and provides visual feedback to the operator. The second module is a central module which processes the commands and controls the attached annunciators and accessories. The vehicle light control system of the present invention has the ability to interface with and control several types of annunciators.

Abstract: A U-turn indicator having a series of sequentially illuminated lights forming the shape of `U`. The indicator is for vehicles or vehicle travel paths. In combination with a vehicle, a plurality of indicators is used. Preferably, an anterior non-inverted `U`, a posterior inverted `U`, and a side laterally dispositioned `U`. In combination with vehicle travel paths, an inverted `U` indicator is used in conjunction with a conventional traffic light or the equivalent. The U-turn indicator is activated by an actuator (a operator accessible switch in a vehicle or a vehicle presence sensor in the path). The control module responds to the actuator and generates a control signal, thus sequentially illuminating the series of lights.

Abstract: A recreational personal trailerable vehicle, such as a boat, is provided with a rear brake light. The boat; boat electrical harness, and trailer combination is safer for being towed in traffic. The boat includes a rear-mounted brake light, located in the stern of the boat, activated in concert with the brake lights of a motorized towing vehicle, to warn following motorists that the boat and trailer combination is slowing down. Further, the electrical cable supplying power to the rear brake light is concealed, providing an aesthetically pleasing appearance to the boat. An electrical harness is connected to a power supply on the motorized vehicle and supplies power to both the rear brake light of the boat, and a pair of spaced rear-mounted brake lights of the trailer. Optionally, the rear lights are activated by a transmitter-receiver arrangement that activates a power source electrically connected to the rear light.

Abstract: A cyclops light as now mandated by law on the panel above the rear doors of a van is relocated as side-by-side lights to the inside adjacent corners of the doors and each provided with a triad of lens so that, when a door is open, as when loading and unloading the van, the light now seen through the triad lens is a safety signal to a motorist approaching from the rear, and the light seen through the previously used rear lens is still in use, but as a safety signal to a motorist approaching from the front in a passing lane.

Abstract: A system having an integrated control unit for installation in an emergency vehicle, the unit responsive to inputs and operative to output control signals to emergency vehicle electrical apparatus through a pre-fabricated wiring harness. The wiring harness is designed with connectors and an overall configuration requiring only minor alterations to the vehicle structure, allowing easy installation primarily through ducts and openings used by the vehicle manufacturer for conventional wiring installations. The harness is designed to be readily removable for installation in another vehicle of either the same or different model, when the existing vehicle is to be retired from service. The system has numerous features including an opto-isolator and noise filter to provide a reliably detected signal indicative of the state of the vehicle's transmission, the control unit operative in response to modify the emergency vehicle conditions when the vehicle is stopped.

Abstract: An emergency signal lamp device for a vehicle, includes a lamp door disposed on a portion of the vehicle, an emergency signal lamp disposed behind the lamp door and being elastically movable from the vehicle, and a latch mechanism for moving the lamp door to control the movement of the emergency signal lamp, whereby the emergency signal lamp generates a turn signal when an original signal lamp is out of order.

Abstract: A completely solid state rotary beacon which produces a rotary beacon lighting effect without the use of mechanical components or rotating parts. The device of the present invention includes a plurality of light sources which are equicircumferentially spaced around the outer perimeter of the rotary beacon. These light sources are intermittently illuminated by an electronic controller in such a fashion that the illusion of a rotating light beacon is produced without the need for rotating mechanical components. The lighting sequence, in conjunction with the unique parabolic reflector arrangement of the present invention, create the illusion of a light source being rotated in a 360.degree. path. This effect is achieved by the present invention without the use of rotating mechanical components.

Abstract: A lighting system and method for broadcasting colored lights as emergency warning signals from a light source. A centralized continuous light source is coupled via a fiber optic transmission medium to an external display location such as a lens or the like located on a vehicle. The color and the relative intensity of each color is periodically modulated to alternate between at least two states such that the contrast between these alternating states is perceived by observers to be a flashing source of light with no off-time. The frequency and the duty cycle of the repetition rate of alternating between the states may be further controlled to better draw attention to the light source. In one embodiment, the external display locations include optical converters, each converter having multiple input facets and optically arranged to broadcast light received at its facets at predetermined vertical and horizontal output angles.

Abstract: To promote safer use of an industrial van of a type having a body with right and left pivotally hinged doors usually opened preparatory to workmen working out of the rear of the van, there is provided an additional light display on a cooperating edge of each of the doors in facing relation to an oncoming motorist to mark the stationary van as a road obstruction.

Abstract: This invention is an enhancement to current automobile safety by providing addition information to a trailing vehicle concerning the rate of acceleration and deceleration of a vehicle equipped with the invention. The invention involves a weight which responses to inertial forces involved in acceleration and deceleration by the sequential activation of red lights in response to deceleration and green lights in response to acceleration.

Abstract: A signalling light visible through a rear window of a vehicle including a primary electrically energizable signaling light unit having a first array of green light-emitting diodes, a second array of red light-emitting diodes, and a third array of yellow light-emitting diodes. A pair of secondary electrically energizable signaling light units including a fourth array of red light-emitting diodes are positioned at a left extent of the rear window and a fifth array of red light-emitting diodes are positioned at a right extent of the rear window.

Abstract: A U-turn signal apparatus including a vehicle with a front end and a rear end having two colored lights. The colored lights include a front left light situated on the front end at a left extent thereof and a rear left light situated on the rear end at a left extent thereof. The front left light is positioned adjacent to a conventional turn signal light. The rear left light is positioned adjacent to a conventional reverse light. Finally, control circuitry is situated within the vehicle and electrically connected to the front left light and rear left light. The control circuitry is adapted to actuate the front left light and the rear left light at the discretion of a user.

Abstract: An automotive vehicle alert system for indicating changes in vehicle operation mode. The automotive vehicle rear end collision prevention system includes a power source, brake switching apparatus connected in series to the power source and responsive to the position of the brake pedal of the automotive vehicle, accelerator switching apparatus connected in series to the power source and responsive to the position of the accelerator pedal of the automotive vehicle, and a light disposed at a high point of the automotive vehicle rear and connected in series to the power source. When the brake pedal and the accelerator pedal are both released, the brake switching apparatus and the accelerator switching apparatus closes illuminating the light and warning a trailing automotive vehicle that the automotive vehicle is changing operation which prevents rear end collisions, discourage tailgating and panic stops under normal traffic conditions, and improve visibility and perception.

Abstract: A warning light is integrated with a fixed position, externally mounted rear-view mirror, the warning light having a housing which forms an aerodynamically contoured extension of the mirror. A light head is received by the housing such that, when the housing is engaged by the rear-view mirror, the light head assembly means generally faces towards the front of the vehicle.

Abstract: There is provided a synchronous strobe system for synchronizing a flash rate of a plurality of strobe devices positioned along a loop of an alarm system. After the alarm system is energized and activated, a control panel of the synchronous strobe system will transmit a synchronization signal or pulse along the loop at periodic time intervals. Each synchronization signal is detected by a electronic circuit of the strobe device, including a microcontroller. Upon detection of each synchronization signal, the microcontroller determines whether to operate the strobe device in Sync required mode or Sync not required mode. For Sync required mode, the synchronization signal must be detected by the strobe device to flash a strobe light of the strobe device. Otherwise, the microcontroller waits for the next synchronization signal before attempting to flash the strobe light.

Abstract: An interface system for use in a motor vehicle to be converted to a police or emergency vehicle includes a switch panel array operating an array of relays which in turn controls a lamp unit such as a conventional light bar. A video camera and VCR are mutually coupled to a VCR control which in turn responds to a control logic to provide automatic operation of the VCR during events. A canine alert system includes temperature sensing and engine electrical system sensing and responds to an air conditioning failure or engine stall condition to produce a transmitted alert signal using a pager or beeper or the like. A power management system monitors the operating supply voltage of the vehicle and sequentially shuts down the emergency light apparatus as the battery voltage decreases. A back-up light and brake light kill responds to a panel control switch for interrupting the activity of brake lights and back-up lights.

Abstract: An improved blackout control system located within the passenger compartment allows the driver to alter the normal and emergency lighting features of the vehicle. The blackout control system comprises an illuminated control panel unit modified by harness and control units which are attached to the lighting system of a conventional emergency vehicle. Three emergency "Red" switches are provided as an improvement on the control panel. A fourth blackout switch is provided on the panel which disables the brake and backup lights of the vehicle. A fifth switch for blacking out the tail lights, parking and/or corner lights is provided. A sixth sneak light switch is provided to activate a hooded sneak light located in front of the vehicle which may be used to provide less lighting in front of the vehicle than the normal horizontally disposed headlights.

Abstract: A system and method for generating and broadcasting emergency lighting signals wherein the lights are synchronized such that when a first light is energized with a packet of short, rapid bursts, a second light begins to flash before the first light is de-energized. Control circuitry connected to the power source selectively controls the packetized energization of the light sources and includes timing circuitry for periodically energizing a first of the light sources for a first duration and for energizing a second of the light source for a second duration. The second duration overlaps, but is not coincident with the first duration in a repeating pattern such that the first and second sources are periodically energized simultaneously before the first source is de-energized.

Abstract: A school bus stop sign (10) of the type rotatably coupled to a school bus (18) and movable between a retracted position adjacent to the school bus (18) and an extended position extending outwardly from the school bus (18) is disclosed. The bus stop sign (10) is characterized by an array of light emitting diodes (34) disposed on the bus stop sign (10) to provide illumination thereto.

Abstract: A control circuit for a center high mounted brake light of an automobile includes a tachometer for generating a voltage signal in response to a speed of the automobile, a preamplifier for amplifying the voltage signal from the tachometer to a predetermined voltage range, a voltage-controlled oscillator for outputting an oscillating signal in proportion to the voltage signal from the preamplifier, and a flicker circuit having a frequency divider for receiving the oscillating signal from the voltage-controlled oscillator and flickering the brake light in accordance with an output signal of the frequency divider,

Abstract: A cyclops light as now mandated by law on the panel above the rear doors of a van is relocated as side-by-side lights to the inside adjacent corners of the doors. Each light is provided with a side lens so that when a door is open, as when loading and unloading the van, the light is seen through the side lens as a safety signal to a motorist approaching from the rear. The light seen through the previously used rear lens is still in use, but as a safety signal to a motorist approaching from the front in a passing lane.

Abstract: An emergency vehicle multiple sound siren disabling circuit is disclosed having a multiple sound siren circuit for emanating signals equivalent to a particular type of sound with an amplifier adapted for connection to a speaker. The siren circuit has a switch for selecting respective siren sounds and a circuit for disabling the multiple sound siren when the emergency vehicle transmission is placed in a park or neutral position. The circuit further disables the multiple sound siren after the emergency vehicle transmission is removed from the park or neutral mode, and enables it again after selective inputs thereto.

Abstract: A vehicle lighting system, for use in automobiles or trucks has a tail lamp relay, connected so electrical current flows through the vehicle battery, a tail lamp, and the tail lamp relay when the relay is on; a tail lamp switch; a battery low voltage sensor; taillamp programming means; and means for sensing that the vehicle is in operation. The system also has control circuitry that turns on the relay in the first state when the vehicle is in operation and the tail lamp switch is on, or following the vehicle ceasing operation, the taillamp programming means is on, and the battery low voltage sensing means senses a high battery voltage, but where the relay is turned off when the vehicle is not in operation and either the taillamp programming means is off, the taillamp switch is off, or the battery low voltage sensing means senses a low battery voltage.

Abstract: An illuminated door handle assembly includes a door handle seamed to a door at a defined location and moveable between latching and unlatching positions, a signal generator for transforming energy into a signal and an energy receiver in communication with the signal generator for receiving the signal therefrom and conducting the signal to the door handle such that the signal is emitted from the door handle to indicate the location thereof.

Abstract: A car-used distress sign which is normally in a horizontally linear pattern and can be immediately changed into a triangular pattern by the driver in case the car breaks down without getting out of the car. The distress sign includes a base, a left warning member, a central warning member and a right warning member. The base is disposed with two pivot seats at two ends. A latch hook and a first resilient member are pivotally connected with each pivot seat. Two electromagnetic pulling members are disposed on the base. The latch hooks are connected with the pulling members by driving strings. The left and right warning members are disposed with latch pins for engaging with the latch hooks. A second resilient member is disposed on the central warning member and two pairs of third resilient members are disposed at two ends of the base. Two pushing blocks are disposed at two ends of the second resilient member to pivotally connect with the left and right warning members respectively.

Abstract: For a popular dome-shaped industrial van having rear left and right doors, an added pair of tail lights at the top of the van rear edge to which the doors are hinged. Which in the location noted the tail lights are visible to an oncoming motorist when the doors are open through the clearance bounded by the outwardly diverging van rear edges and upper door edges, thus contributing to safer use during loading and unloading of the industrial van.

Abstract: A stoplight system that includes a light source for providing a light output, and an array of non-overlapping lenslets comprised of first lenslets and second lenslets, each first lenslet configured to refract a portion of the light output of the light source into a first predetermined angular field comprising a central angular region having vertical and horizontal extent, and each second lenslet configured to refract a portion of the light output of the light source into a second predetermined angular field comprising first and second peripheral angular regions that are horizontally on either side of the central angular region, whereby the portions of the light output of the light source that are refracted by the first and second lenslets form stoplight illumination.

Abstract: To promote safer use of an industrial van of a type having a body with right and left pivotally hinged doors usually opened preparatory to workmen working out of the rear of the van, there is provided an additional tail light on a cooperating edge of each of the doors in facing relation to an oncoming motorist to mark the stationary van as a road obstruction.

Abstract: A a three-pole toggle switch intended for mounting upon the handlebar of a motorcycle proximate one handlebar grip and wiring enabling connection to the electrical system of a motorcycle allows control of the turn indicator signals. With proper installation the wiring of the motorcycle is supplanted, and the device functions as an override control of the turn indicator system. This device is intended particularly for systems requiring constant application of pressure upon a button contact to maintain activation of a turn signal which action precludes the use of either the clutch or the front brake and control of the throttle during use of the turn signal, depending upon whether the left or right side indicator, respectively, is employed. An appropriately wired and positioned device enables the rider to activate and maintain activation of either turn indicator by positioning of the toggle without restriction to the use of either hand.

Abstract: A controller for a strobe light on the back of the truck causes the light to flash whenever the truck's transmission is either in reverse or in park, and is contingent upon operation of hazard lights. The strobe light is placed in a location on the back of the truck where other lights are not normally found, such as on a centerline of the back panel of the truck, and approximately 40-inches off the ground. The strobe light has approximately half the brightness of a stop light and about one-third the brightness of turn signals, but it is attention getting because the light has a very sharp pulse form. The lens of the strobe light is amber, which matches the color of a caution light on most stop and go traffic lights and on the flashing direction signals. A control circuit for the strobe light includes a pair of switches which are operated responsive to a lighting of the clearance lights and a shifting of a transmission into either a park or a neutral position, respectively, for lighting the strobe light.

Abstract: A method of communication between vehicle operators. The invention employs common display LEDs, the segments of which when appropriately turned on issue desired messages on the reader board for the operators of other vehicles. To issue a message the operator of a vehicle simply depresses a button on the control box, the operator of a vehicle behind sees the message for a length of time set by a monostable timmer.

Abstract: A system for flashing a plurality of light sources, such as the headlights, taillights, brake lights and/or turn signal indicators of an automotive vehicle which includes a plurality of light switching circuits wherein one light switching circuit is associated with each light source. Each light switching circuit is responsive to a predetermined input signal to switch its associated light source between an on and an off condition. A microprocessor has a plurality of output signal lines wherein one output line is electrically connected with each light switching circuit. The microprocessor is preprogrammed to generate the predetermined input signals to the light switching circuits on its output signal lines in a predetermined sequence.

Abstract: A light bar is provided for mounting to a roof of an emergency vehicle such that the signalling devices comprising the light bar are distributed across the roof to form a non-linear pattern. A dome assembly covers the signalling devices and also forms a non-linear pattern traversing the roof. The light bar provides for enhanced visibility at angles approaching 90.degree. to the heading of the vehicle. Moreover, the non-linear pattern of the signalling devices allows the light bar to provide a signalling pattern whose warning effect can be alternatively directionalized into different distinct zones about the vehicle. In a preferred embodiment, each of the signalling devices is contained in a module comprising a base and a dome such that enhanced transmittance of light is provided at angles approaching 90.degree. from the heading of the vehicle.