Study of Offset Control between 2 intersections

Abstract

The aim of signal coordination is to minimize delay and number of stops at all intersections. The simple case of the coordination effect for one link between two intersections with 0.5 green ratio had been discussed and revealed theoretically. However, it is not clear for any green ratios. In this paper, the conception of coordination effect is reexamined and a general formula is introduced. The coordination effect is formulated with cycle length, link length and round travel time for any green ratio. This study reveals the followings. The coordination effect is high when round-trip travel time equals to cycle length or N-times match of cycle length. The coordination effect is low when round-trip travel time equals to green time (= red signal start point) or N-times match of cycle length plus green time.