Traffic prediction and control system for vehicle traffic flows at traffic intersections

• US 9,633,560 B1
• Filed: 03/30/2016
• Issued: 04/25/2017
• Est. Priority Date: 03/30/2016
• Status: Active Grant

• Current Assignee: Chao Gao, Jason Hao Gao
• Original Assignee: Chao Gao, Jason Hao Gao
• Inventors: Gao, Jason Hao, Gao, Chao
• Primary Examiner(s): Nguyen, Hung T
• Application Number:
  US15/084,793
• Time in Patent Office: 391 Days
• Field of Search: 340907, 340910, 340916, 340919, 340922, 340937, 701117, 701118
• CPC Class Codes: G08G 1/0145 for active traffic flow control
• CPC Class Codes: G08G 1/07 Controlling traffic signals

Abstract

A method and a traffic prediction and control system (TPCS) for predicting and controlling vehicle traffic flow through a traffic intersection dynamically with proximal traffic intersections are provided. The TPCS dynamically receives sensor data from sensors at a local traffic intersection, determines traffic flow parameters, and determines a traffic flow flux using the traffic flow parameters. The TPCS dynamically receives analytical parameters from sensors at proximal traffic intersections and determines a minimum safe driving distance between leading and trailing vehicles, a traffic free flow density, a synchronized traffic flow density, and a traffic jam density to predict transitions of the vehicle traffic flow across traffic flow phases through the local traffic intersection. The TPCS controls the vehicle traffic flow by dynamically adjusting duration of traffic signals of the local traffic intersection and transmitting traffic signal time adjustment instructions to the proximal traffic intersections to maintain an optimized traffic flow flux.

Claims

1. A method for predicting and controlling vehicle traffic flow through a traffic intersection dynamically with proximal traffic intersections, the method employing a traffic prediction and control system comprising at least one processor configured to execute computer program instructions for performing the method, the method comprising:

dynamically receiving and processing sensor data from one or more sensors positioned at a local traffic intersection by the traffic prediction and control system;

dynamically determining traffic flow parameters comprising a traffic flow speed, a traffic flow density, and a number of vehicles proximal to the local traffic intersection by the traffic prediction and control system using the dynamically received and processed sensor data;

dynamically determining a traffic flow flux by the traffic prediction and control system using the dynamically determined traffic flow parameters;

dynamically receiving and processing analytical parameters from one or more sensors positioned at one or more proximal traffic intersections by the traffic prediction and control system via a communication network, wherein the one or more proximal traffic intersections comprise an upstream traffic intersection and a downstream traffic intersection with respect to the local traffic intersection;

dynamically determining a minimum safe driving distance between a leading vehicle and a trailing vehicle among the vehicles proximal to the local traffic intersection by the traffic prediction and control system using the dynamically received and processed analytical parameters;

dynamically determining a traffic free flow density, a synchronized traffic flow density, and a traffic jam density by the traffic prediction and control system using the dynamically determined minimum safe driving distance, the traffic flow speed, a predefined speed limit, a traffic jam speed, an average length of the vehicles, road conditions, and one or more of the dynamically received and processed analytical parameters;

predicting transitions of the vehicle traffic flow across traffic flow phases through the local traffic intersection by the traffic prediction and control system using the dynamically determined traffic free flow density, the dynamically determined synchronized traffic flow density, and the dynamically determined traffic jam density; and

controlling the vehicle traffic flow through the local traffic intersection by the traffic prediction and control system by dynamically adjusting duration of traffic signals of the local traffic intersection and transmitting traffic signal time adjustment instructions to each of the one or more proximal traffic intersections based on the predicted transitions of the vehicle traffic flow from the local traffic intersection, wherein the control of the vehicle traffic flow through the local traffic intersection comprises;

requesting the upstream traffic intersection via the communication network to send one of more vehicle traffic flow and less vehicle traffic flow towards the local traffic intersection by the traffic prediction and control system to maintain an optimized traffic flow flux based on conditions associated with the traffic flow density and the traffic flow speed; and

dynamically determining and optimally controlling a duration of a green traffic signal light for the vehicles moving in a direction with the dynamically determined traffic flow flux one of closer to and further away from the optimized traffic flow flux for the traffic flow speed and the traffic flow density at the local traffic intersection by the traffic prediction and control system by using the dynamically determined traffic flow parameters and by controlling the vehicle traffic flow from the upstream traffic intersection.

2. The method of claim 1, wherein the control of the vehicle traffic flow through the local traffic intersection by the traffic prediction and control system further comprises:

synchronizing the traffic signals of the local traffic intersection with traffic signals of the upstream traffic intersection to allow less vehicle traffic flow to pass through the upstream traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection by the traffic prediction and control system based on the traffic flow flux at the upstream traffic intersection being not more than the traffic flow flux at the local traffic intersection and the traffic flow flux at the local traffic intersection being more than half of a maximum traffic flow flux; and

synchronizing the traffic signals of the local traffic intersection with traffic signals of the downstream traffic intersection to allow more vehicle traffic flow to pass through the local traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection by the traffic prediction and control system based on the traffic flow flux between the downstream traffic intersection and a subsequent downstream traffic intersection being lesser than the traffic flow flux at the local traffic intersection.

3. The method of claim 1, further comprising dynamically receiving and processing the analytical parameters from one or more sensors positioned in each of the vehicles proximal to the local traffic intersection by the traffic prediction and control system via the communication network for the determination of the minimum safe driving distance between the leading vehicle and the trailing vehicle among the vehicles proximal to the local traffic intersection and for the dynamic determination of the traffic free flow density, the synchronized traffic flow density, and the traffic jam density.

4. The method of claim 1, wherein the analytical parameters comprise an average reaction time of average drivers of the vehicles, an average traffic flow speed of the vehicles, an average vehicle mass, an average friction between the vehicles and a road, and an average air drag force of the vehicles.

5. The method of claim 1, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow density being greater than the dynamically determined traffic free flow density, and the traffic flow density being lesser than the dynamically determined traffic jam density.

6. The method of claim 1, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow speed being less than a predefined percentage of the predefined speed limit, and the traffic flow speed being greater than zero.

7. The method of claim 1, further comprising assigning a one-time priority pass to classified vehicles by the traffic prediction and control system to allow the classified vehicles to pass through the local traffic intersection before resuming normal operations, wherein the classified vehicles are in operable communication with the traffic prediction and control system over the communication network.

8. The method of claim 1, wherein the traffic flow phases comprise a traffic free flow phase, a synchronized traffic flow phase, and a jam traffic flow phase.

9. A traffic prediction and control system for predicting and controlling vehicle traffic flow through a traffic intersection dynamically with proximal traffic intersections, the traffic prediction and control system comprising:

a non-transitory computer readable storage medium configured to store computer program instructions defined by modules of the traffic prediction and control system;

at least one processor communicatively coupled to the non-transitory computer readable storage medium, the at least one processor configured to execute the defined computer program instructions;

a plurality of sensors operably coupled to the at least one processor and in operable communication with one or more of the modules of the traffic prediction and control system, the sensors configured to detect the vehicle traffic flow through the traffic intersection; and

the modules of the traffic prediction and control system comprising;

a data communication module configured to dynamically receive and process sensor data from one or more of the sensors positioned at a local traffic intersection;

a traffic flow parameter determination module configured to dynamically determine traffic flow parameters comprising a traffic flow speed, a traffic flow density, and a number of vehicles proximal to the local traffic intersection using the dynamically received and processed sensor data;

the traffic flow parameter determination module further configured to dynamically determine a traffic flow flux using the dynamically determined traffic flow parameters;

the data communication module further configured to receive and process analytical parameters from one or more sensors positioned at one or more proximal traffic intersections via a communication network, wherein the one or more proximal traffic intersections comprise an upstream traffic intersection and a downstream traffic intersection with respect to the local traffic intersection;

the traffic flow parameter determination module further configured to dynamically determine a minimum safe driving distance between a leading vehicle and a trailing vehicle among the vehicles proximal to the local traffic intersection using the dynamically received and processed analytical parameters;

the traffic flow parameter determination module further configured to dynamically determine a traffic free flow density, a synchronized traffic flow density, and a traffic jam density using the dynamically determined minimum safe driving distance, the traffic flow speed, a predefined speed limit, a traffic jam speed, an average length of the vehicles, road conditions, and one or more of the dynamically received and processed analytical parameters;

a traffic prediction module configured to predict transitions of the vehicle traffic flow across traffic flow phases through the local traffic intersection using the dynamically determined traffic free flow density, the dynamically determined synchronized traffic flow density, and the dynamically determined traffic jam density; and

a traffic control module configured to control the vehicle traffic flow through the local traffic intersection by dynamically adjusting duration of traffic signals of the local traffic intersection and transmitting traffic signal time adjustment instructions to each of the one or more proximal traffic intersections based on the predicted transitions of the vehicle traffic flow from the local traffic intersection, wherein the traffic control module comprises;

a traffic control communication module configured to request the upstream traffic intersection via the communication network to send one of more vehicle traffic flow and less vehicle traffic flow towards the local traffic intersection to maintain an optimized traffic flow flux based on conditions associated with the traffic flow density and the traffic flow speed; and

a traffic control optimization module configured to dynamically determine and optimally control a duration of a green traffic signal light for the vehicles moving in a direction with the dynamically determined traffic flow flux one of closer to and further away from the optimized traffic flow flux for the traffic flow speed and the traffic flow density at the local traffic intersection by using the dynamically determined traffic flow parameters and by controlling the vehicle traffic flow from the upstream traffic intersection.

10. The traffic prediction and control system of claim 9, wherein the traffic control module further comprises a synchronization module configured to synchronize the traffic signals of the local traffic intersection with traffic signals of the upstream traffic intersection to allow less vehicle traffic flow pass through the upstream traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection based on the traffic flow flux at the upstream traffic intersection being not more than the traffic flow flux at the local traffic intersection and the traffic flow flux at the local traffic intersection being more than half of a maximum traffic flow flux.

11. The traffic prediction and control system of claim 10, wherein the synchronization module is further configured to synchronize the traffic signals of the local traffic intersection with traffic signals of the downstream traffic intersection to allow more vehicle traffic flow to pass through the local traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection based on the traffic flow flux between the downstream traffic intersection and a subsequent downstream traffic intersection being lesser than the traffic flow flux at the local traffic intersection.

12. The traffic prediction and control system of claim 9, wherein the analytical parameters comprise an average reaction time of average drivers of the vehicles, an average traffic flow speed of the vehicles, an average vehicle mass, an average friction between the vehicles and a road, and an average air drag force of the vehicles.

13. The traffic prediction and control system of claim 9, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow density being greater than the dynamically determined traffic free flow density, and the traffic flow density being lesser than the dynamically determined traffic jam density.

14. The traffic prediction and control system of claim 9, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow speed being less than a predefined percentage of the predefined speed limit, and the traffic flow speed being greater than zero.

15. The traffic prediction and control system of claim 9, wherein the traffic control optimization module is further configured to assign a one-time priority pass to classified vehicles to allow the classified vehicles to pass through the local traffic intersection before resuming normal operations, wherein the classified vehicles are in operable communication with the traffic prediction and control system over the communication network.

16. The traffic prediction and control system of claim 9 operably connected to a traffic monitoring system via the communication network, wherein the traffic monitoring system is configured to monitor and override functions of the traffic prediction and control system positioned at the local traffic intersection and the each of the one or more proximal traffic intersections to maintain the optimized traffic flow flux.

17. The traffic prediction and control system of claim 9, wherein the traffic flow phases comprise a traffic free flow phase, a synchronized traffic flow phase, and a jam traffic flow phase.

18. The traffic prediction and control system of claim 9, wherein the sensors comprise video cameras, laser devices, and inductive loop detectors.

19. A non-transitory computer readable storage medium having embodied thereon, computer program codes comprising instructions executable by at least one processor for predicting and controlling vehicle traffic flow through a traffic intersection dynamically with proximal traffic intersections, the computer program codes comprising:

a first computer program code for dynamically receiving and processing sensor data from one or more sensors positioned at a local traffic intersection;

a second computer program code for dynamically determining traffic flow parameters comprising a traffic flow speed, a traffic flow density, and a number of vehicles proximal to the local traffic intersection using the dynamically received and processed sensor data;

a third computer program code for dynamically determining a traffic flow flux using the dynamically determined traffic flow parameters;

a fourth computer program code for dynamically receiving and processing analytical parameters from one or more sensors positioned at one or more proximal traffic intersections via a communication network, wherein the one or more proximal traffic intersections comprise an upstream traffic intersection and a downstream traffic intersection with respect to the local traffic intersection;

a fifth computer program code for dynamically determining a minimum safe driving distance between a leading vehicle and a trailing vehicle among the vehicles proximal to the local traffic intersection using the dynamically received and processed analytical parameters;

a sixth computer program code for dynamically determining a traffic free flow density, a synchronized traffic flow density, and a traffic jam density using the dynamically determined minimum safe driving distance, the traffic flow speed, a predefined speed limit, a traffic jam speed, an average length of the vehicles, road conditions, and one or more of the dynamically received and processed analytical parameters;

a seventh computer program code for predicting transitions of the vehicle traffic flow across traffic flow phases through the local traffic intersection using the dynamically determined traffic free flow density, the dynamically determined synchronized traffic flow density, and the dynamically determined traffic jam density; and

an eighth computer program code for controlling the vehicle traffic flow through the local traffic intersection by dynamically adjusting duration of traffic signals of the local traffic intersection and transmitting traffic signal time adjustment instructions to each of the one or more proximal traffic intersections based on the predicted transitions of the vehicle traffic flow from the local traffic intersection, wherein the eighth computer program code comprises;

a ninth computer program code for requesting the upstream traffic intersection via the communication network to send one of more vehicle traffic flow and less vehicle traffic flow towards the local traffic intersection to maintain an optimized traffic flow flux based on conditions associated with the traffic flow density and the traffic flow speed; and

a tenth computer program code for dynamically determining and optimally controlling a duration of a green traffic signal light for the vehicles moving in a direction with the dynamically determined traffic flow flux one of closer to and further away from the optimized traffic flow flux for the traffic flow speed and the traffic flow density at the local traffic intersection by using the dynamically determined traffic flow parameters and by controlling the vehicle traffic flow from the upstream traffic intersection.

20. The non-transitory computer readable storage medium of claim 19, wherein the eighth computer program code further comprises:

an eleventh computer program code for synchronizing the traffic signals of the local traffic intersection with traffic signals of the upstream traffic intersection to allow less vehicle traffic flow pass through the upstream traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection based on the traffic flow flux at the upstream traffic intersection being not more than the traffic flow flux at the local traffic intersection and the traffic flow flux at the local traffic intersection being more than half of a maximum traffic flow flux; and

a twelfth computer program code for synchronizing the traffic signals of the local traffic intersection with traffic signals of the downstream traffic intersection to allow more vehicle traffic flow to pass through the local traffic intersection to avoid accumulation of the vehicle traffic flow at the local traffic intersection based on the traffic flow flux between the downstream traffic intersection and a subsequent downstream traffic intersection being lesser than the traffic flow flux at the local traffic intersection.

21. The non-transitory computer readable storage medium of claim 19, wherein the analytical parameters comprise an average reaction time of average drivers of the vehicles, an average traffic flow speed of the vehicles, an average vehicle mass, an average friction between vehicles and a road, and an average air drag force of the vehicles.

22. The non-transitory computer readable storage medium of claim 19, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow density being greater than the dynamically determined traffic free flow density, and the traffic flow density being lesser than the dynamically determined traffic jam density.

23. The non-transitory computer readable storage medium of claim 19, wherein the conditions for controlling the vehicle traffic flow through the local traffic intersection comprise the traffic flow speed being less than a predefined percentage of the predefined speed limit, and the traffic flow speed being greater than zero.

24. The non-transitory computer readable storage medium of claim 19, wherein the eighth computer program code further comprises a thirteenth computer program code for assigning a one-time priority pass to classified vehicles to allow the classified vehicles to pass through the local traffic intersection before resuming normal operations.