Signal Coordination The main limitation with their derivations are based on the assumption of uniform traffic arrivals throughout the cycle and a constant saturation flow rate during the effective green period, as well as no queue at the start of the effective red period or at the end of the effective green period. nonuniform arrivals are very likely in most traffic flow situations, and are frequently the case for signalized arterials. Thus, the assumption of uniform arrivals throughout the cycle is generally unrealistic and is likely to yield considerable error compared with values measured in the field.
One of the biggest influences on the arrival pattern of vehicles at each approach to the intersection is the level of signal coordination along the roadway. The term signal coordination generally refers to the level of timing coordination, or synchronization, between adjacent signals on the roadway.
Ideally, traffic signals should be timed so that as many vehicles as possible arrive at the signalized intersection when the signal indication is green, which would indicate good signal coordination. If a large proportion of vehicles arrive at an intersection during the red interval, the signal coordination would be considered poor. From a delay perspective, the larger the proportion of vehicles arriving during green, the lower the signal delay, and the larger the proportion of vehicles arriving during red, the higher the signal delay.
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