Some aspects of capacity analysis of unsignalized intersections.

This article describes a method of calculating the capacity of unsignalized intersections using the Harders / Siegloch model. The model's ability to calculate the capacity of non-priority approach lanes for different flow conditions of major traffic streams is discussed first, followed by an estimation of the influence of single lane traffic on the capacity of non-priority approach lanes. Improvements to the model are required in both areas. Delay studies have shown that a splitting into different levels of service is reasonable. In this connection the limits for maximum permissive delays depending on the priority of the traffic stream considered need to be defined. A proposal is submitted for the determination of permissible traffic volumes of minor streams. A simple method for the measurement of critical and move-up gaps should be developed.