Traffic Signal Cycle Setting Method During Undersaturated Flow for Alternating One-way Traffic

Abstract

In this study, a construction signal cycle setting method was proposed for undersaturated flow for alternating one - way traffic on general roads. Nomograms were constructed to examine the effects of each variable on the construction signal cycle setting and to verify its applicability using field observation data. The nomograms which are presented in this paper demonstrated that traffic capacity increases in proportion to the length of the signal cycle, and that establishing a longer cycle length is an effective way to increase capacity when the length of the regulated section is long. In addition, field observation data validated that the cycle length estimated by the proposed formula is typically shorter than the actual cycle length due to the fact that the actual signal operation is conducted by setting slightly longer all red time. This tendency indicates that a buffer should be incorporated into the nomogram presented in this study.