| 摘要 |
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 G<SUB>max </SUB>is set longer with an increase of a traffic volume on an access road corresponding to a phase in question (Steps T 8 and T 9 ). 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 (FIG. 6 ).
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