Complicated delay relationships are required for signalized intersections, unsignalized intersections, weaving sections, and two-lane roads. For these situations, delay on a single link is a function of volumes on two or more links. Strict application of the HCM procedures would result in networks with multiple equilibrium solutions. It is likely that the burdens of network calibration will be considerably reduced with such a model. Levels of adaptation are important to the results of travel forecasts.
Adaptation is a principal justification calibrating a network.
The HCM provides sufficient information about the relationships between volume, capacity and delay to build assignment algorithms that are highly adaptive. This site will be under constant change. If you have any suggestions for improving the site, please send a message to Lynette Engelke . This page was updated October 5, 1998.