引用:
原帖由 futfuk 於 2009-7-24 12:55 PM 發表
if the intersection isn't too big, they usually just throw in a 2 seconds "all red" phase, where the signals are all red in all direction, to make sure the traffic is cleared out, before the next ...
It also related to the flow of traffic
If a lane with all trucks during the morning or night time
For normal cars, 20 sec is enough for 5-6 cars
but 3 trucks
Then the trucks may build up the traffic by its length etc