Abstract: Embodiments described herein may provide a method for management of vehicles at intersections. Methods may include: receiving probe data from probe apparatuses proximate an intersection between two or more road segments; identifying a first vehicle approaching the intersection from the probe data; determining, for the first vehicle approaching the intersection, a safe stop distance, where the safe stop distance includes a distance to stop the first vehicle from a current speed of the first vehicle; generating a warning message in response to the safe stop distance of the first vehicle being greater than a distance of the first vehicle from the intersection; and providing the warning message to one or more other vehicles approaching, at, or within the intersection, where the warning message provides an indication that the first vehicle cannot safely stop before entering the intersection.

Abstract: An electronic communications method includes receiving, by a device, electronic information. The electronic communications method also includes analyzing, by the device, the electronic information. The electronic communications method also includes determining, by the device, that the electronic information includes sound that is associated with an emergency vehicle. The electronic communications method also includes sending, by the device, an electronic command to change a traffic signal light from one color to another color.

Abstract: Railroad crossing object detection systems and methods include radar sensors detecting object presence, speed and heading in a different manner. A controller compares signal outputs from the different sensors to provide traffic control preemption signals and self-diagnose sensor problems. The sensor devices may include an ultra-wideband (UWB) impulse radar device and at least one reflective device providing failsafe object presence detection and object non-presence detection in redundant fashion with at least a second sensor device such as a side-fired radar device.

Abstract: The invention provides systems and methods for an Intelligent Road Infrastructure System (IRIS), which facilitates vehicle operations and control for connected automated vehicle highway (CAVH) systems. IRIS systems and methods provide vehicles with individually customized information and real-time control instructions for vehicle to fulfill the driving tasks such as car following, lane changing, and route guidance. IRIS systems and methods also manage transportation operations and management services for both freeways and urban arterials. In some embodiments, the IRIS comprises or consists of one of more of the following physical subsystems: (1) Roadside unit (RSU) network, (2) Traffic Control Unit (TCU) and Traffic Control Center (TCC) network, (3) vehicle onboard unit (OBU), (4) traffic operations centers (TOCs), and (5) cloud information and computing services.

Abstract: There is described an electrical cabinet for a traffic signaling system. The electrical cabinet generally has a housing; an input encoder, the input encoder having input ports receiving input signals carrying states associated with input devices of the traffic signaling system, a serial encoding circuit serially encoding the states of the input signals into a headerless signal, the headerless signal beginning with a first time slot and ending with a last time slot temporally spaced apart from the first time slot, the time slots carrying the states of the input signals, and an output port; and a traffic light controller having a serial decoding circuit receiving the headerless signal and serially decoding the headerless signal to retrieve the states of the input signals carried by the time slots of the headerless signal, the traffic light controller controlling the traffic signaling system based on the retrieved states.

Abstract: A control device may have a plurality of buttons that may be backlit to multiple levels, such as first, second, and third adjacent buttons positioned in order, and first, second, and third LEDs positioned to illuminate a respective button. The control device may be configured to illuminate the first LED to a first LED illumination intensity to illuminate the respective button to a first surface illumination intensity; illuminate the third LED to a second LED illumination intensity to illuminate the respective button to a second surface illumination intensity; and illuminate the second LED to a third LED illumination intensity to illuminate the respective button to the second surface illumination intensity. The third LED illumination intensity may be less than the second LED illumination intensity, which may be less than the first LED illumination intensity, and the second surface illumination intensity may be less than the first surface illumination intensity.

Abstract: The present disclosure provides a system and method for traffic violation detection. The system may determine a target object which should be given precedence with respect to a vehicle from one or more moving objects by performing an angle correction on the one or more moving objects, wherein the one or more moving objects are objects moving in a predetermined region. When it is determined that a moving direction of the target object is a moving direction towards middle of a road and a target vehicle passing through the predetermined region is not courteous to the target object, the system may mark a state of the target vehicle as a violation state.

Abstract: Methods, systems, and processor-readable media for adaptive cycle-level traffic signal control are described. An adaptive cycle-level traffic signal controller and control method that operate within a continuous action space. A reinforcement learning algorithm called Proximal Policy Optimization (PPO), which is a type of actor-critic model for reinforcement learning, may be used to generate signal cycle phase durations selected from a continuous range of values. The controller thus does not treat the action space as discrete, but instead produces continuous values as output. The generated phase durations may define a full traffic signal cycle. The inputs to the controller may indicate current and past states of the traffic environment. The average duration of delay of vehicles in the traffic environment may be used to calculate the reward for the reinforcement learning model that drives the behavior of the controller.

Abstract: A warning system for warning vulnerable road users (VRUs) includes an edge computing device having a graphics processing unit (GPU), one or more sensors that acquire spatial-temporal data of road users, and one or more warning devices that output a warning to warn targeted VRUs of danger. The GPU uses one or more artificial intelligence (AI) algorithms to process the spatial-temporal data of the road users to predict a path, trajectory, behavior, and intent for the road users. The GPU then analyzes the predictions of the road users to determine convergences between the predictions to determine threat interactions and identify targeted VRUs. In response to determining threat interactions and identifying the targeted VRUs, the edge computing device outputs targeting instructions and warning response instructions to the one or more warning devices to deploy the one or more warning devices to warn the targeted VRUs.

Abstract: A control method for traffic lights includes: acquiring an image at a preset time point before a red light is turned off, wherein the image includes at least one vehicle waiting for the red light; determining a time length according to the image, wherein the time length is generated by an artificial intelligence algorithm; and controlling a green light according to the time length.

Abstract: One example system for detecting an emergency siren comprises a microphone device, a band pass filter operably coupled to the microphone device and configured to filter sound data from the microphone device to produce filtered sound data, a phase lock loop circuit configured to phase filter the filtered sound data to produce phase filtered data, and a processor configured to determine a presence of a siren signal from the phase filtered data.

Abstract: An autonomous vehicle including a projector and a sensor system configured to output data representative of an object in an environment exterior of the autonomous vehicle. The autonomous vehicle can further include a data store that stores height map data. A computing system of the autonomous vehicle can classify an object as a person and can detect an initial position of the person. Responsive to the detection, the computing system can calibrate a notification to be projected on a ground of the environment exterior of the autonomous vehicle. The notification is based on output of a transform from a position of the projector to the ground and the transform is applied based on the predefined height map of the ground. The notification can be projected adjacent the person. The notification may be configured to inform the person that the autonomous vehicle detects a position of the person.

Abstract: A method for permitting a target vehicle to safely violate a right-of-way system of rules is described. The method may comprise, amongst other things, providing a roadway system, wherein the movements of vehicles within the roadway system are governed by a right-of-way system of rules; controlling a traffic control system including a plurality of traffic control signals in a manner that causes the plurality of traffic control signals to change in accordance with default control pattern for implementing the right-of-way system of rules; and modifying the default control pattern. By doings so, the method may permit a target vehicle to safely violate the right-of-way system of rules. Similarly, by doing so, the method may prevent a plurality of secondary vehicles from traveling along or through a predicted path of the target vehicle.

Abstract: Methods, devices and a computer-readable medium comprising instructions for determining applicable traffic regulations for a motor vehicle are provided. In some embodiments, the position and direction of movement of the motor vehicle are determined. The position and direction of movement of the motor vehicle are then transmitted to a back end by a transmission apparatus of the motor vehicle. In response to the information transmitted to the back end, information concerning traffic regulations applicable to the position of the motor vehicle is received by the transmission apparatus. The transmission of the position and direction of movement of the motor vehicle to the back end is carried out in a cyclical manner or in accordance with information concerning the validity of the traffic regulations, which is included in the information concerning the traffic regulations applicable at the position of the motor vehicle.

Abstract: A monitor device is provided with an imaging device that shoots an overhead line and a current collector, and a controller that processes an image. The controller includes a day or night determination processing section, and an image processing section that switches a parameter for recognizing the overhead line and the current collector in the image by executing image processing different in the daylight and at night based upon the result of the day or night determination. Further, there are provided reference photographic subjects to be shot by the imaging device in positions different from the overhead line and the current collector in an image area to be shot, and the day or night determination processing section performs the determination of day or night based upon a luminance average value of the reference photographic subjects inputted into an image input section.

Abstract: An autonomous vehicle including a projector and a sensor system configured to output data representative of an object in an environment exterior of the autonomous vehicle. The autonomous vehicle can further include a data store that stores height map data. A computing system of the autonomous vehicle can classify an object as a person and can detect an initial position of the person. Responsive to the detection, the computing system can calibrate a notification to be projected on a ground of the environment exterior of the autonomous vehicle. The notification is based on output of a transform from a position of the projector to the ground and the transform is applied based on the predefined height map of the ground. The notification can be projected adjacent the person. The notification may be configured to inform the person that the autonomous vehicle detects a position of the person.

Abstract: A method and apparatus for adjusting channelization of a traffic intersection are proposed. The specific implementation of the method is: obtaining a first traffic characteristic of vehicles at each of a plurality of target positions in a process of vehicles in a target traveling direction traveling through the traffic intersection from upstream to downstream in a preset first time period; generating first traffic change information of the traffic intersection based on the first traffic characteristic at each of the plurality of target positions; and in response to that the first traffic change information satisfies a preset first change distribution, generating channelization adjustment information for non-motorized vehicle lanes of the traffic intersection.

Abstract: There is disclosed herein examples of system and procedure for generating a model to be implemented within autonomous vehicles for identifying assertive vehicles at an intersection having stop indicators. The model can be generated via data-driven procedure where captures of the movement of vehicles through an intersection are analyzed and utilized for generating the model. The model may be provided to the autonomous vehicles and may be implemented by the autonomous vehicles for identifying assertive vehicles.

Abstract: The present disclosure provides an apparatus and system that may allow a user to facilitate the flow of traffic over contained environments or otherwise. This apparatus and system may improve management for the flow of traffic by providing a lower barrier for entry for municipalities and other entities to collaborate on traffic management. In some embodiments, those in control may create a tiered system for a series of lights within a connected block. In some implementations, those in control may create a tiered system over a larger grid system, such as an entire neighborhood, district, city, or state. In some aspects, the apparatus and system may allow those in control to set priorities for how to handle developing traffic conditions.

Abstract: A method is provided for generating training data to facilitate automatically locating an object of interest within an image. Methods may include: receiving sensor data including a plurality of images from at least one image sensor; receiving an identification, from a user, of an object visible within an image of the plurality of images, where at least a portion of the object is visible in one or more of the plurality of images; determining a predicted location of the object in the one or more of the remaining images of the plurality of images; identifying the object in the one or more of the remaining images of the plurality of images; and storing the plurality of images including an indication of the object at the object location within the one or more of the plurality of images.

Abstract: The present disclosure proposes an intelligent road side unit and a regulation method thereof. The intelligent road side unit comprises: traffic lights; a first camera configured to acquire a first image and having a first focal length; a second camera configured to acquire a second image and having a second focal length, the first focal length being greater than the second focal length; and a controller, configured to acquire anticipated arriving traffic flow information according to the first image, to acquire current traffic flow information according to the second image, and to control the traffic lights according to the anticipated arriving traffic flow information and the current traffic flow information.

Abstract: A traffic signal control system having a program running thereon to monitor and control operations of a traffic light at a road intersection, the traffic signal control system including a storage device to store traffic data regarding a flow of traffic around the traffic light, at least one traffic signal controller to execute the program to adjust a setting of the traffic light based on the traffic data received from the storage device for a heavy traffic street with a plurality of vehicles thereon, such that the at least one traffic signal controller performs at least one of adjusting a red light to a green light and keeping the green light for a predetermined period of time, and at least one traffic management device to execute the program to manage the at least one traffic signal controller and the traffic data received from the storage device.

Abstract: Systems and methods provide, implement, and use using a computer-vision based methods of context-sensitive monitoring and characterization of driver behavior. Additional systems and methods are provided for unsupervised learning of action values, monitoring of a driver's environment, and transmitting visual information from a client to a server.

Abstract: A method of operating an intersection traffic signal includes operating the intersection traffic signal based on a standard signal pattern, determining an adverse road condition on a road surface adjacent an intersection, and determining when a first vehicle on the road surface is within a predetermined distance of the intersection. A signal time period is adjusted for the intersection traffic signal when the adverse road condition is present and the first vehicle is within a predetermined distance of the intersection.

Abstract: A method of controlling traffic at a first intersection having a first traffic light is disclosed, including monitoring traffic at the first intersection and storing traffic information from the monitoring in memory; receiving traffic information relating to one or more other intersections in an area in which the first intersection is located; determining a timing sequence for the first traffic light based at least in part upon the traffic information from the monitoring and the received traffic information; and updating control of the first traffic light to utilize the determined timing sequence.

Abstract: A driving control apparatus for an intersection traffic light array is provided. The intersection traffic light array includes Nxi horizontal ground traffic light sets. The Nxi horizontal ground traffic light sets include a horizontal ground traffic light set pxi which is disposed at an intersection safety line position of an entrance lane xi of a planar intersection. The Nxi horizontal ground traffic light sets further include a horizontal ground traffic light set qxi which is disposed at a stop line position of the entrance lane xi. Each horizontal ground traffic light set includes at least one traffic light, and part or all of traffic lights of a horizontal ground traffic light set i are provided with a wireless driving signal input port and/or a wired driving signal input port.

Abstract: When an own vehicle is highly likely to collide with an obstacle, a notification of prompting a driver to carry out a collision avoidance operation is appropriately given. When an output request for collision avoidance support information exists, a notification ECU notifies of the collision avoidance support information irrespective of absence/presence of an output request for vehicle-infrastructure cooperation support information. When the output request for the collision avoidance support information does not exist and the output request for the vehicle-infrastructure cooperation support information exists, the notification ECU notifies of the vehicle-infrastructure cooperation support information.

Abstract: Navigation devices, services, and methods are provided for determining an average traffic speed for a path segment using probe data from a plurality of navigation devices. The method for determining an average traffic speed may include retrieving probe data from a plurality of navigation devices, each navigation device traveling over at least a portion of a defined path segment for at least a portion of a defined time interval, wherein the probe data for each navigation device comprises an instantaneous velocity of the navigation device. The method may further include calculating a total distance traveled and a total time traveled by the plurality of navigation devices over the path segment and within the time interval using the instantaneous velocities from the retrieved probe data. The average traffic speed may then be determined based on the calculated total distance traveled and total time traveled.

Abstract: A system and method for avoiding collisions in a traffic intersection using radar sensors is disclosed. The system detects the location, speed, size, and direction of travel of objects, including vehicles and vulnerable road users, in and approaching a traffic intersection. Using this information, trajectories for all objects are determined, and, if a likelihood of a collision is determined, one or more traffic signal transitions are delayed in an attempt to avoid the collision.

Abstract: In a traffic simulation in which vehicle models, which simulate vehicles, are moved in a road system model including links, which simulate the smallest segment of roads divided by intersections, etc., and nodes, which simulate the intersections, turning points of the roads, etc., the presence/absence of an entering vehicle model that enters a different link from a link in the road system model via the node is judged; the velocity of the entering vehicle model after entering the different link is calculated on the basis of the density of the vehicle models in the different link after the entering vehicle model has entered the different link; and the calculated velocity is set only for the entering vehicle model that has entered the different link.

Abstract: A vehicle support information system mounted in a vehicle, the vehicle support system including: a man-detecting unit; a vehicle-position detecting unit; a communication unit; a man-position/waiting-score calculating unit; a stopping-vehicle determining unit determining whether or not the vehicle should be stopped, based on a man position and a waiting score of an at least one potential-crossing-man; a travelling controller for stopping the vehicle when the stopping-vehicle determining unit determines that the vehicle should be stopped; and a man-crossing-signal display unit displaying information to inform the at least one potential-crossing-man whether or not the at least one potential-crossing-man can safely cross the road, based on an instruction of the stopping-vehicle determining unit, wherein the man-position/waiting-score calculating unit outputs the man-position/waiting-score to the communication unit.

Abstract: A method of restricting turns at vehicle intersections imposes a policy that is dynamic and congestion based. Vehicle turns are allowed only to the extent that such a maneuver does not cause a hindrance to other vehicles traveling the same direction that are not turning. A hindrance may be defined in a variety of ways based on whether other vehicles are substantially impeded in their progress. In this way, such a “no hinder” turn restriction is dependent on actual driving conditions and allows for more efficient movement of traffic in both heavily congested and light driving conditions. A no hinder turn restriction may be combined with or may replace other types of turn restrictions and may be utilized for both left and right turns and for streets with single or multiple lanes.

Abstract: Methods and systems for traffic management are disclosed. Location information and a vehicle identifier for a vehicle are received. A current status of the vehicle is determined. Further, it is determined whether the vehicle is located within a defined distance from a lane intersection. A traffic indicator is generated when the vehicle is located within the pre-defined distance from the lane intersection. The traffic indicator is one of a Right of Way (ROW), Stop, Yield or Null. The generated traffic signal is transmitted back to the vehicle.

Abstract: Approaches for monitoring traffic signal preemption at one or more intersections. According to one embodiment, a road map that includes a plurality of roads and intersections is displayed with a computer system. Preemption data periodically received by the computer system from at least one preemption controller at a respective intersection is used to update the road map. In response to the preemption data, the road map is updated to include a traffic signal icon at the respective intersection and a vehicle icon at a location on the map corresponding to a location of a vehicle transmitting a preemption request as indicated by the preemption data.

Abstract: Systems and method are disclosed for adaptive and/or autonomous traffic control. In one illustrative implementation, there is provided a method for processing traffic information. Moreover, the method may include receiving data regarding travel of vehicles associated with an intersection, using neural network technology to recognize types and/or states of traffic, and using the neural network technology to process/determine/memorize optimal traffic flow decisions as a function of experience information. Exemplary implementations may also include using the neural network technology to achieve efficient traffic flow via recognition of the optimal traffic flow decisions.

Abstract: A system for controlling traffic for allowing passage of an emergency vehicle through an intersection controlled by traffic signals includes an intersection module for transmitting signals for preempting the traffic signals and one or more circuit cards coupled to the intersection module. Each expansion card includes a plurality of contact closures for outputting one or more of the signals for preempting the traffic signals. The intersection module selects an expansion card based on a type of output desired, and further selects one or more contact closures of the selected card for the desired output. The expansion cards allow preempt or vehicle outputs beyond the output that a single card can provide. According to another embodiment, the output expansion is achieved by emulating the communication interface between the intersection module and the traffic signal controller.

Abstract: A vehicle support system for supporting a man in safely crossing a road without crosswalks installed is provided.

Abstract: A system and method for traffic information delivery may be implemented as a static network device for sharing information with network nodes. The system includes a processor in communication with a transceiver and memory, the memory containing code that when executed by the processor effects the method steps for determining an occurrence of a traffic incident within a defined distance from the device, establishing communication with a network node, receiving a device identifier over a public network from the network node, the device identifier based on a user-configurable parameter and a non-user-configurable parameter of the network node, establishing in response to the device identifier matching an authorized device identifier corresponding to a known network node, a secure private network with the network node, and sending information about the traffic incident to the network node via the secure private network.

Abstract: According to a method of vehicular traffic management, a computer system receives, from devices distributed in a plurality of roadway segments of a physical roadway system, real-time traffic information individually describing vehicular traffic in each the plurality of roadway segments. The computer system determines from the real-time traffic information an advised speed for a particular roadway segment among the plurality of roadway segments. The computer system transmits, via a communication network, a speed advisory command specifying the advised speed to a device in the particular roadway segment for presentation.

Abstract: Provided is a traffic signal control system that can operate in a flexible and sophisticated manner by, after selecting a pattern of a traffic signal control parameter corresponding to the current time using a first pattern switching table that is used in a time-controlled pattern selection scheme, selecting again a pattern using an additional second pattern switching table, where a call condition for selecting a set pattern is set in the second pattern switching table, and by selecting the pattern set in the second pattern switching table in place of the pattern selected in the first pattern switching table if a calculated travel time matches the call condition.

Abstract: A method of optimizing the traffic control at a traffic signal-controlled intersection in a road traffic network. The vehicle traffic in entrances to the intersection are controlled by signal groups of a traffic signal system according to associated signal times. For vehicles approaching the signal group, traffic parameters are determined from traffic data using a traffic model according to the signal times, and in order to determine optimal signal times, the traffic parameters are weighted and added up and the target function formed in such a way is optimized by varying the signal times. By individually determining the traffic parameters for each vehicle and individually weighting the traffic parameters according to the strategic relevance thereof for the implementation of a specified traffic strategy, an improved implementation of the specified traffic strategy is made possible.

Abstract: The present invention provides a display for traffic control within a region of traffic flow, comprising an array of lights arranged for illumination to indicate to traffic seeking to negotiate the region in accordance with a first path of travel the likely movement of traffic seeking to negotiate the region in accordance with a second path of travel different from the first, and thus whether said traffic seeking to negotiate the region in accordance with said second path of travel has a right of way over traffic seeking to negotiate the region in accordance with said first path of travel.

Abstract: A traffic resource allocation method is provided for allocating traffic resources around an intersection formed by a first road and a second road. The method includes dividing the first road into two or more first lanes at a first direction and two or more second lanes at a second direction opposite but parallel to the first direction. The method also includes dividing the second road into two or more third lanes at a third direction and two or more four lanes at a fourth direction opposite but parallel to the third direction. Further, the method includes controlling traffic movements in the intersection by allocating traffic permit to both pedestrian traffic and vehicle traffic on the first road and the second road. The method also include, when permitting pedestrian traffic along the first direction and the second direction, permitting through vehicle traffic along the first direction and the second direction, and prohibiting turn traffic at any of the first, second, third, and fourth directions.

Abstract: Methods and systems for creating an approach map for a traffic signal preemption controller. A road map is displayed, and in response to user input for instantiating a first segment of an approach map, a first instance of a graphical object overlaying one of the plurality of roads is displayed. The one road represents an approach road to an intersection having the preemption controller. First segment location data that describes a first geographical area bounded by the first segment are determined from size and placement of the first instance of the graphical object on the road map and from location data associated with the one road. The first segment location data are stored in association with the approach map for the preemption controller. The preemption controller, once configured with the first segment location data, initiates traffic signal preemption in response to a preemption request transmitted from within the first geographical area described by the first segment location data.

Abstract: A traveling support device includes: a road-vehicle communication portion that receives first current-signal information relating to a signal displayed by a traffic signal at a first clock time, from a road side transmitter installed on a road; an inter-vehicle communication portion that receives second current-signal information relating to a signal displayed by the traffic signal at a second clock time, from another vehicle that receives the second current-signal information from the road side transmitter; and a signal cycle estimating portion that estimates signal cycle information relating to transition of the signal on the traffic signal on the basis of the first current-signal information received by the road-vehicle communication portion and the second current-signal information received by the inter-vehicle communication portion.

Abstract: A drive assist device and method capable of preventing the confusion of a driver at a traffic signal with an arrow lamp are provided. An ECU has a section for determining whether or not it is possible to pass a signal, which determines whether or not a vehicle can pass a signal, and a signal waiting time notification control section, which determines a signal waiting time of the vehicle and displays it on a display unit when the section for determining whether or not it is possible to pass a signal determines that the vehicle cannot pass a signal. The section for determining whether or not it is possible to pass a signal determines not only a lighting time of only a red signal but also a lighting time of a red signal and an arrow lamp and a lighting time of a yellow signal subsequent thereto are determined as a no-pass time.

Abstract: A traffic control system for converting an intersection into a roundabout during periods of heavy traffic includes a mechanism for monitoring traffic flow through the intersection and about the roundabout. The system also includes a concave opening in and around the intersection and a concrete disc disposed in the cavity, a hydraulic lift is constructed and arranged to elevate the concrete disc above the level of the road and lights provided to alert motor vehicles to enter a roundabout defined by the elevated disc. The system also includes traffic lights for alerting a motor vehicle operator to drive onto the disc or around the disc to use the intersection and/or roundabout.

Abstract: An image recording apparatus suitable for recording a traffic signal violation at an intersection controlled by a traffic light is described. The image recording apparatus includes a first camera focused on the intersection, and a second camera focused on a first lane of a street leading to the intersection. A first control circuit is coupled to the first camera causes the first camera to capture a first image at substantially an instant of time that the traffic light indicates a change of traffic control status. The apparatus also includes a detection circuit to detect when a portion of a vehicle crosses a trigger location in the first lane after the change in traffic control status. A second control circuit coupled to the second camera causes the second camera to capture a close-up image of the vehicle in the event that the detection circuit detects the portion of the vehicle at the trigger location after a change in traffic control status.

Abstract: A traffic control system and device is provided. The traffic control system of the instant invention permits two-way communication between a plurality of traffic signal devices and/or other devices or locations. Each traffic signal device locally controls the state of the traffic signals, while communication between the traffic signal devices is used to synchronize the internal timers or clocks of the plurality of traffic control devices.

Abstract: Managing traffic signal preemption at a plurality of intersections. In one approach a security level code that specifies one of a plurality of security levels for at least one jurisdiction is input. The security level controls which emitter codes are allowed to preempt traffic signals at the intersections in the jurisdiction. A set of emitter codes for the plurality of intersections in the jurisdiction is determined in response to the security level code. The set of emitter codes is downloaded to a plurality of preemption controllers at the plurality of intersections in the jurisdiction. Each preemption controller accepts a preemption request only if the preemption request contains an emitter code indicated by the downloaded set of emitter codes as being allowed to preempt traffic signals at the intersections in the jurisdiction.