Road traffic analysis methods and apparatuses

Patent metadata

Field	Value
Publication number	US-11380195-B2
Application number	US-201916542258-A
Country	US
Kind code	B2
Filing date	Aug 15, 2019
Priority date	Feb 15, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Embodiments of the present disclosure can provide a road traffic analysis method and an apparatus. The method can comprise obtaining a traffic parameter of a road intersection by analyzing road traffic information of the road intersection, determining a reference adjustment length for each phase of a traffic signal cycle corresponding to each lane of the road intersection based on the road traffic information and the traffic parameter. The traffic signal cycle has one or more phases. The method can also comprise determining a first adjustment length when a difference between the reference adjustment length and the first adjustment length satisfies a condition associated with the lanes of the road intersection and the corresponding traffic parameter, and adjusting the phases of the traffic light cycle at the road intersection based on the first adjustment length for each phase.

First claim

What is claimed is:

1. A road traffic analysis method, comprising:
obtaining a traffic parameter of a road intersection by analyzing road traffic information of the road intersection;
determining a plurality of unbalance indexes based on the road traffic information and the traffic parameter, the plurality of unbalance indexes comprising first unbalance indexes of lanes;
determining second unbalance indexes of traffic stream directions based on the first unbalance indexes of the lanes;
determining a traffic unbalance index of the road intersection based on the second unbalance indexes of the traffic stream directions; and
in response to a determination that the traffic unbalance index satisfies a traffic unbalance threshold, identifying the road intersection as an unbalanced intersection with unbalanced road traffic.

2. The road traffic analysis method according to claim 1 , wherein the first unbalance index of the lane is determined based on a difference between a normalized upstream traffic speed and a normalized downstream traffic speed of the lane, the normalized upstream traffic speed of the lane is obtained by normalizing a traffic speed of the upstream section of the lane, and the normalized downstream traffic speed of the lane is obtained by normalizing a traffic speed of the downstream section of the lane.

3. The road traffic analysis method according to claim 1 , wherein the second unbalance index of the traffic stream direction is determined based on a weighted sum of the first unbalance indexes of all lanes in the traffic stream direction, the weight of the weighted sum being a proportion that traffic volume of each lane accounts for in traffic volume of all lanes having the same direction.

4. The road traffic analysis method according to claim 1 , wherein determining the traffic unbalance index of the road intersection based on the second unbalance indexes of the traffic stream directions comprises:
determining a traffic unbalance index of the road intersection based on weighted sums of the second unbalance indexes of all traffic stream directions having a same phase in a traffic signal cycle of the road intersection along with a sum of absolute values of the weighted sums, wherein the traffic signal cycle has one or more phases;
wherein the weight of the second unbalance index is a proportion that the traffic volume of each traffic stream direction accounts for in traffic volume of all traffic directions having the same phase.

5. The road traffic analysis method according to claim 1 , further comprising:
after identifying the road intersection as an unbalanced intersection with unbalanced road traffic,
determining, based on at least one of the road traffic information or the traffic parameter, a reference adjustment length for each phase of each lane of the road intersection;
determining a first adjustment length when a difference between the reference adjustment length and the first adjustment length satisfies a condition associated with the lanes of the road intersection and the corresponding traffic parameter; and
adjusting the phases of the traffic light cycle at the road intersection based on the first adjustment length for each phase.

6. The road traffic analysis method according to claim 5 , wherein the reference adjustment length for each phase of the lane is determined based on a product of a speed difference times a phase adjustment coefficient, the speed difference being a difference between a traffic speed of the upstream road section and a traffic speed of the downstream road section of the lane.

7. The road traffic analysis method according to claim 6 , wherein at least one of the reference adjustment length or the first adjustment length is determined using a phase adjustment model, and the phase adjustment coefficient is obtained through learning and training with the phase adjustment model.

8. The road traffic analysis method according to claim 5 , wherein a sum of the first adjustment length of each phase in a phase cycle for the lane in the traffic signal cycle equals 0.

9. A road traffic analysis apparatus comprising:
a memory storing a set of instructions; and
one or more processors configured to execute the set of instruction to cause the apparatus to perform:
obtaining a traffic parameter of a road intersection by analyzing road traffic information of the road intersection,
determining a plurality of unbalance indexes based on the road traffic information and the traffic parameter, the plurality of unbalance indexes comprising first unbalance indexes of lanes,
determining second unbalance indexes of traffic stream directions based on the first unbalance indexes of the lanes;
determining a traffic unbalance index of the road intersection based on the second unbalance indexes of the traffic stream directions, and
in response to a determination that the traffic unbalance index satisfies a traffic unbalance threshold, identifying the road intersection as an unbalanced intersection with unbalanced road traffic.

10. The road traffic analysis apparatus according to claim 9 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
after identifying the road intersection as an unbalanced intersection with unbalanced road traffic,
determining, based on at least one of the road traffic information or the traffic parameter, a reference adjustment length for each phase of each lane of the road intersection;
determining a first adjustment length when a difference between the reference adjustment length and the first adjustment length satisfies a condition associated with the lanes of the road intersection and the corresponding traffic parameter; and
adjusting the phases of the traffic light cycle at the road intersection based on the first adjustment length for each phase.

11. A non-transitory computer readable medium that stores a set of instructions that is executable by at least one processor of a computer to cause the computer to perform a road traffic analysis method, the method comprising:
obtaining a traffic parameter of a road intersection by analyzing road traffic information of the road intersection;
determining a plurality of unbalance indexes based on the road traffic information and the traffic parameter, the plurality of unbalance indexes comprising first unbalance indexes of lanes;
determining second unbalance indexes of traffic stream directions based on the first unbalance indexes of the lanes;
determining a traffic unbalance index of the road intersection based on the second unbalance indexes of the traffic stream directions; and
in response to a determination that the traffic unbalance index satisfies a traffic unbalance threshold, identifying the road intersection as an unbalanced intersection with unbalanced road traffic.

12. The non-transitory computer readable medium according to claim 11 , wherein the first unbalance index of the lane is determined based on a difference between a normalized upstream traffic speed and a normalized downstream traffic speed of the lane, the normalized upstream traffic speed of the lane is obtained by normalizing a traffic speed of the upstream section of the lane, and the normalized downstream traffic speed of the lane is obtained by normalizing a traffic speed of the downstream section of the lane.

13. The non-transitory computer readable medium according to claim 11 , wherein the second unbalance index of the traffic stream direction is determined based on a weighted sum of the first unbalance indexes of all lanes in the traffic stream direction, the weight of the weighted sum bei

Assignees

• Alibaba Group Holding Ltd

Inventors

• Min Wanli
• Wang Jiawei
• Wang Zhenggang

Classifications

• G08G1/08 Primary

  according to detected number or speed of vehicles · CPC title

• G08G1/07

  Controlling traffic signals · CPC title

• G08G1/0125 Primary

  Traffic data processing · CPC title

• G08G1/083

  Controlling the allocation of time between phases of a cycle · CPC title

• G08G1/0145

  for active traffic flow control · CPC title