Traffic control method for relieving vehicle congestion on parallel roads

• US 5,703,778 A
• Filed: 06/01/1995
• Issued: 12/30/1997
• Est. Priority Date: 07/19/1991
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takatoo, Masao, Suzuki, Toshiko, Furukawa, Souichi, Takahashi, Kazunori, Nagai, Tohru, Hamada, Nobuhiro
• Primary Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US08/457,500
• Time in Patent Office: 943 Days
• Field of Search: 364/436, 364/437, 364/438, 340/909, 340/910, 340/911, 340/913
• US Class Current: 701/118
• CPC Class Codes: G08G 1/08 according to detected number or speed of vehicles

Abstract

A road traffic control method is provided which can continue to maximize the number of vehicles allowed to run on a road and shorten time required for a vehicle to reach a destination, by preventing and relieving congestion. The method controls traffic of vehicles running on each of a plurality of parallel running roads. Each road is made connected at an interval of a predetermined distance, and at least one of the plurality of roads has a plurality of lanes. The method includes the steps of: detecting traffic of vehicles running in two counter directions on each road, at a position before at least one connected point of each of the plurality of roads; and changing ratio between the numbers of lanes of at least one of the plurality of roads, in accordance with the detected traffic of vehicles running in the two counter directions.

Claims

1. A method of controlling traffic of vehicles running on each of a plurality of parallel running roads, each of said roads being connected at points positioned at an interval of predetermined distance, and at least one of said plurality of roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said roads, at a position before at least one connecting point of each of said plurality of roads; and

changing a ratio of the number of lanes assigned to a particular direction of at least one of said plurality of roads, in accordance with said detected traffic of vehicles running in the two counter directions.

2. A method according to claim 1, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of automatically changing the position of a center line for dividing the plurality of lines into two groups of lanes corresponding to the two counter directions.

3. A method according to claim 1, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of displaying information of a lane change before a branch point of each road.

4. A method according to claim 3, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make each of said roads have the same vehicle running priority direction.

5. A method according to claim 3, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make said roads have opposite vehicle running priority directions.

6. A method according to claim 1, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

7. A method of controlling traffic of vehicles running on each of a plurality of parallel running roads, each of said roads being connected at points positioned at an interval of a predetermined distance, and at least one of said plurality of roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said plurality of roads; and

changing a ratio of the number of lanes assigned to a particular direction of at least one of said plurality of roads, in accordance with said detected traffic of vehicles running in the two counter directions.

8. A method according to claim 7, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of automatically changing the position of a center line for dividing the plurality of lines into two groups of lanes corresponding to the two counter directions.

9. A method according to claim 7, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of displaying information of a lane change before a branch point of each road.

10. A method according to claim 9, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make each of said roads have the same vehicle running priority direction.

11. A method according to claim 9, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make said roads have opposite vehicle running priority directions.

12. A method according to claim 7, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

13. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at points positioned at an interval of a predetermined distance, and at least one of said first and second roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said first and second roads, at a position before a connecting point of each of said first and second roads; and

changing a ratio of the number of lanes assigned to a particular direction of at least one of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions.

14. A method according to claim 13, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of automatically changing the position of a center line for dividing the plurality of lines into two groups of lanes corresponding to the two counter directions.

15. A method according to claim 13, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of displaying information of a lane change before a branch point of each road.

16. A method according to claim 13, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

17. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at points positioned at an interval of a predetermined distance, and at least one of said first and second roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said first and second roads; and

changing a ratio of the number of lanes assigned to a particular direction of at least one of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions.

18. A method according to claim 17, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of automatically changing the position of a center line for dividing the plurality of lines into two groups of lanes corresponding to the two counter directions.

19. A method according to claim 17, wherein said step of changing the ratio of the number of lanes assigned to a particular direction includes a step of displaying information of a lane change before a branch point of each road.

20. A method according to claim 17, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

21. A method of controlling traffic of vehicles running on each of plurality of parallel running roads, each of said roads being connected at a point positioned at an interval of a predetermined distance, and a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said roads, at a position before at least one connecting point of each of said plurality of roads; and

controlling an offset parameter of a plurality of traffic lights on each of said roads, in accordance with said detected traffic of vehicles running in the two counter directions.

22. A method according to claim 21, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make each of said roads have the same vehicle running priority direction.

23. A method according to claim 21, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make said roads have opposite vehicle running priority directions.

24. A method of controlling traffic of vehicles running on each of a plurality of parallel running roads, each of said roads being connected at a point positioned at an interval of a predetermined distance, and a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said plurality of roads; and

controlling an offset parameter of a plurality of traffic lights on each of said roads, in accordance with said detected traffic of vehicles running in the two counter directions.

25. A method according to claim 24, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make each of said roads have the same vehicle running priority direction.

26. A method according to claim 24, wherein said step of controlling an offset of a plurality of traffic lights includes a step of controlling so as to make said roads have opposite vehicle running priority directions.

27. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at a point positioned at an interval of a predetermined distance, and a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on both of said first and second roads, at a position before a connecting point of both of said first and second roads; and

controlling an offset parameter of a plurality of traffic lights on both of said roads, in accordance with said detected traffic of vehicles running in the two counter directions.

28. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at a point positioned at an interval of a predetermined distance, and a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on both of said first and second roads;

changing a ratio of the number of lanes assigned to a particular direction of at least one of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions; and

controlling an offset parameter of a plurality of traffic lights on both of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions.

29. A method according to claim 28, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

30. A method of controlling traffic of vehicles running on each of a plurality of parallel running roads, each of said roads being connected at points positioned at an interval of a predetermined distance, a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, and at least one of the plurality of roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said roads, at a position before at least one connecting point of each of said plurality of roads; and

controlling an offset parameter of a plurality of traffic lights on each of said roads, in accordance with said detected traffic of vehicles running in the two counter directions.

31. A method of controlling traffic of vehicles running on each of a plurality of parallel running roads, each of said roads being connected at points positioned at an interval of a predetermined distance, a plurality of intersections with traffic lights being installed on each of said roads at intervals of the predetermined distance, and at least one of said plurality of roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on each of said plurality of roads;

changing a ratio of the number of lanes assigned to a particular direction of at least one of said plurality of roads, in accordance with said detected traffic of vehicles running in the two counter directions; and

controlling an offset parameter of a plurality of traffic lights on each of said roads, in accordance with said detected traffic of vehicles running in the two counter directions.

32. A method according to claim 31, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

33. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at points positioned at an interval of a predetermined distance, a plurality of intersections with traffic lights being installed on both of said first and second roads at intervals of the predetermined distance, and at least one of said first and second roads having a plurality of lanes, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on both of said first and second roads, at a position before a connecting point of said first and second roads;

changing a ratio of the number of lanes assigned to a particular direction of at least one of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions; and

controlling an offset parameter of a plurality of traffic lights on both of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions.

34. A method according to claim 33, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.

35. A method of controlling traffic of vehicles running on both of first and second parallel running roads, both of said first and second roads being connected at points positioned at an interval of a predetermined distance, and a plurality of intersections with traffic lights being installed on both roads at intervals of the predetermined distance, said method comprising the steps of:

detecting traffic of vehicles running in two counter directions on both of said first and second roads;

changing a ratio of the number of lanes assigned to a particular direction of at least one of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions; and

controlling an offset parameter of a plurality of traffic lights on both of said first and second roads, in accordance with said detected traffic of vehicles running in the two counter directions.

36. A method according to claim 35, wherein said ratio includes the number of lanes assigned to a particular direction in comparison to the number of lanes assigned to a direction counter to the particular direction.