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. The traffic signal control system may further include at least one of at least one camera, at least one sensor, and at least one radar to count a number of the plurality of vehicles moving around the road intersection in real time. The at least one traffic signal controller may communicate to another at least one traffic signal controller to adjust the setting of another traffic light in response to the count of the number of the plurality of vehicles, such that the another 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 another predetermined period of time.

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. The traffic signal control system may further include at least one of at least one camera, at least one sensor, and at least one radar to count a number of the plurality of vehicles moving around the road intersection in real time. The at least one traffic signal controller may communicate to another at least one traffic signal controller to adjust the setting of another traffic light in response to the count of the number of the plurality of vehicles, such that the another 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 another predetermined period of time.

The present disclosure provides a system and a method for jointly controlling one or multiple connected autonomous vehicles (CAVs) and one or multiple manual connected vehicles (MCVs) moving to form traffic on the same or intersecting roads. The method includes collecting states of each of the CAVs, each of the MCVs, and each of traffic signs regulating the traffic, and solving a multi-variable mixed-integer problem (MIP) optimizing a cost function for values of control commands changing states of each CAV and values of control commands changing states of each of the traffic signs. The cost function is optimized subject to a motion model of each of the CAVs, subject to constraints modeling general traffic rules, subject to timing constraints, and subject to a motion model of each MCV. The method further includes transmitting the optimized values of the control commands to the corresponding CAVs and corresponding traffic signs.

An adaptive traffic management system includes a plurality of traffic lights positioned at a plurality of roadway intersections. Associated with each intersection is one or more sensors to detect traffic flow. A control system is connected to the traffic lights and the sensors and based upon data received and predetermined weights for various situations generates a signal timing plan that operates the traffic lights. The control system also may be connected to multiple sources, wearables, and/or in-vehicle sensors that are also used to generate the signal timing plan and operate the traffic lights.

A method for increasing the traffic flow density at a traffic light intersection is disclosed in which vehicles driving straight ahead and vehicles turning left may pass the traffic light intersection simultaneously, wherein the vehicles driving straight ahead are partly equipped vehicles having a Car2X communication, an automatic longitudinal control and a control unit. To increase the traffic flow density, the number of waiting vehicles turning left is transmitted to the equipped vehicles driving straight ahead. Time gaps between the vehicles driving straight ahead is set in dependence upon the number of vehicles turning left by the control unit and the automatic longitudinal control, such that a first share of the time gaps are safety time gaps, which respectively correspond to the required safety distance, and the second share of the time gaps are critical time gaps, which permit at least one vehicle turning left to turn collision-free.

A method for increasing the traffic flow density at a traffic light intersection is disclosed in which vehicles driving straight ahead and vehicles turning left may pass the traffic light intersection simultaneously, wherein the vehicles driving straight ahead are partly equipped vehicles having a Car2X communication, an automatic longitudinal control and a control unit. To increase the traffic flow density, the number of waiting vehicles turning left is transmitted to the equipped vehicles driving straight ahead. Time gaps between the vehicles driving straight ahead is set in dependence upon the number of vehicles turning left by the control unit and the automatic longitudinal control, such that a first share of the time gaps are safety time gaps, which respectively correspond to the required safety distance, and the second share of the time gaps are critical time gaps, which permit at least one vehicle turning left to turn collision-free.

The present application discloses a traffic light control method for an urban road network based on expected return estimation, which uses C-V2X wireless communication technology to obtain real-time information of all vehicles and traffic state in the road network from vehicle-mounted terminals, and adaptively and dynamically controls the phase transformation of the traffic light. According to the present application, the expected returns of keeping the current phase and executing phase switch are calculated by estimating the timely driving distance and the future driving distance of the passable vehicles in the next green light duration in combination with the proposed road priority traffic index. By comparing the expected returns of keeping the current phase or switching to other phases, the best phase is selected, so as to make as many passable vehicles travel farther as possible in the next green light duration. Therefore, the efficiency of traffic will be improved.

The present application discloses a traffic light control method for an urban road network based on expected return estimation, which uses C-V2X wireless communication technology to obtain real-time information of all vehicles and traffic state in the road network from vehicle-mounted terminals, and adaptively and dynamically controls the phase transformation of the traffic light. According to the present application, the expected returns of keeping the current phase and executing phase switch are calculated by estimating the timely driving distance and the future driving distance of the passable vehicles in the next green light duration in combination with the proposed road priority traffic index. By comparing the expected returns of keeping the current phase or switching to other phases, the best phase is selected, so as to make as many passable vehicles travel farther as possible in the next green light duration. Therefore, the efficiency of traffic will be improved.

A method for increasing the traffic flow density at a traffic light intersection is disclosed in which vehicles driving straight ahead and vehicles turning left may pass the traffic light intersection simultaneously, wherein the vehicles driving straight ahead are partly equipped vehicles having a Car2X communication, an automatic longitudinal control and a control unit. To increase the traffic flow density, the number of waiting vehicles turning left is transmitted to the equipped vehicles driving straight ahead. Time gaps between the vehicles driving straight ahead is set in dependence upon the number of vehicles turning left by the control unit and the automatic longitudinal control, such that a first share of the time gaps are safety time gaps, which respectively correspond to the required safety distance, and the second share of the time gaps are critical time gaps, which permit at least one vehicle turning left to turn collision-free.

A method for increasing the traffic flow density at a traffic light intersection is disclosed in which vehicles driving straight ahead and vehicles turning left may pass the traffic light intersection simultaneously, wherein the vehicles driving straight ahead are partly equipped vehicles having a Car2X communication, an automatic longitudinal control and a control unit. To increase the traffic flow density, the number of waiting vehicles turning left is transmitted to the equipped vehicles driving straight ahead. Time gaps between the vehicles driving straight ahead is set in dependence upon the number of vehicles turning left by the control unit and the automatic longitudinal control, such that a first share of the time gaps are safety time gaps, which respectively correspond to the required safety distance, and the second share of the time gaps are critical time gaps, which permit at least one vehicle turning left to turn collision-free.