Control Type Selection at Isolated Intersections Based on Level of Service

Intersection is critical components of an urban transportation network, and the control types of the intersections have an important influence on the traffic flow. The HCM2000 included a figure, Exhibit 10-15, for intersection control type selections. That figure is however from a source external to the HCM. This paper presents a new set of charts for selecting intersections control types among the options of two-way stop sign, signal, and roundabout. Particularly, level of service (LOS) is chosen as the performance index for type selection. 8160 combinations of different levels of demand and a total of 24,480 simulation runs are designed by using Traffic simulation software, four scenarios with 5%, 10%, 15%, and 20% of the different volumes are assigned to make left turns. Each test is made respectively with signalized intersection, two-way stop unsignalized intersection and roundabout. The new set of charts is given as the base of the intersection control type choice and comprehensive benefits for intersection analysis.