Vehicle-Actuated Signal Controller For Heterogeneous Traffic Having Limited Lane Discipline

摘要

Although there are several studies on vehicle-actuated signals, their implementation strategy for heterogeneous traffic is not addressed. This paper proposes several strategies to implement vehicle-actuated controllers for highly heterogeneous traffic conditions having limited lane discipline. These include changing the detector configuration and the loop size, logical grouping of signal phases, and the use of dummy phases. Complex phasing schemes and free-queue parameters are also addressed. The proposed strategies were implemented in various Indian cities and the result from a typical site is presented. The study suggests that overall the VA controllers with the improved implementation strategy performed much better than the existing pre-timed signals. However, the sensitivity of the thresholds for cycle time, green time, gap, and so forth need to be studied; typically with the help of robust simulators. Further, the performance can be significantly improved, especially along the corridor, using a good progression (coordination) model. The study is an important step in devising strategies for the implementation of area traffic control for heterogeneous traffic conditions.