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Traffic signal control method

A technology of traffic signal and control method, which is applied in the direction of traffic control system, control traffic signal, traffic control system of road vehicles, etc., can solve the problems of unsolvable traffic jam and prolonging the green light time, etc.

Inactive Publication Date: 2003-11-26
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traffic jams (a particularly large number of vehicles waiting for a red light) will not be resolved unless the green time is extended beyond the upper limit as needed

Method used

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  • Traffic signal control method
  • Traffic signal control method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] An embodiment of the invention will be described below with the aid of the drawings. In this example, the vehicle remains on the left.

[0027] figure 1 is the floor plan showing the intersection. Highway branches are denoted by lowercase letters a, b, c, and d, respectively. The vehicle sensor Sa is installed on the road branch a, and the vehicle sensors Sb, Sc and Sd are also installed on the road branches b, c and d, respectively.

[0028] The changes to the individual traffic lights for one cycle are listed in Table 1 below.

[0029] 1 cycle

phase

Phase 1

Phase 2

steps

1

2 *

3 *

4

5 *

6 *

road a

green

yellow

red

red

red

red

road b

red

red

red

green

yellow

red

road c

green

yellow

red

red

red

red

road d

red

red

red

green

yellow

red

[0030]...

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PUM

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Abstract

In traffic signal control for setting a green light time to a value between the lower limit time and the upper limit time in real time depending on a traffic volume sensed by vehicle sensors Sa, Sb, and so forth, the upper limit time Gmax is set longer with an increase of a traffic volume on an access road corresponding to a phase in question (Steps T8 and T9). This arrangement is effective for use at an intersection where a traffic volume in one direction is far heavier than in any other direction, and thereby makes it possible to forestall the occurrence of traffic jam.

Description

[0001] This application is based on Application No. 2002-137494 filed in Japan, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a traffic signal control method for setting the time during which a green light is turned on (hereinafter, referred to as the green light time) to a time between a lower limit time and an upper limit time based on traffic volume sensed by a vehicle sensor or the like in real time. value. Background technique [0003] Generally, the green time of traffic signals is controlled as follows. [0004] Vehicle sensors (devices that can detect a passing vehicle, such as an induction coil sensor, an ultrasonic sensor, and a video camera; the same as described below) are set on each road branch of the intersection, and the traffic volume (the number of vehicles passing per unit time) In the case of less than the predetermined value, when the time since the traffic signal turned green has e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/08
CPCG08G1/08
Inventor 西村茂树
Owner SUMITOMO ELECTRIC IND LTD