Signalized road networks are frequent subjects for researchers because they are a source of many transportation problems. Vehicular delays are the primary measure of traffic performance at highway intersections and other locations where traffic is interrupted. Average delay is an important criterion of evaluating traffic signals. Traffic signals, stream merges, and stream splits influence vehicular delay in signalised networks through influencing random fluctuation of traffic. This paper proposes a method of estimating the random component of queues and delays at signalised intersections inside a network of urban streets. Equations describing the effect of signals and traffic merging and splitting are derived, as well as a comprehensive equation combining the considered effects. Fixed speeds and capacities are assumed. The derived comprehensive equation is used to discuss certain cases of signalised streets. The equation is evaluated using the Monte Carlo technique. The proposed method can be incorporated into existing procedures for evaluating and optimising traffic signals. (A)
Abstract