What is the difference between demand used instead of volume in Signals?
Demand is the arrival rate and volume is usually taken to mean stop bar counts. Stop bar counts do not represent demand for congested conditions. In Signals, this plays a significant role in the determination of residual queues that are used to compute d3 delay. Counting the remaining queue at the end of each period is essential for determining total demand for every movement and period. For oversaturated situations, this can make a very significant difference in the overall delays and LOS.
