01334516

Component

It has long been recognized that changing the signal timings in a network will generally cause some re-routing of traffic, and that repeatedly optimizing the signal timings assuming that the current flow pattern will remain fixed may lead to a steady deterioration in network performance (the resultant solution is referred to as the “mutually consistent” (MC) solution, because the flow pattern is a function of the timings and the timings are a function of the flows). On the other hand, if this potential re-routing effect is recognized and taken account of, it may be that signal control can be used beneficially to persuade drivers into a more preferable routing pattern. Consequently, a great deal of work has been carried out over many decades to develop techniques for determining the optimal timings for signals either at isolated intersections or in a coordinated manner in networks of junctions. The primary aim here is to apply a relatively new method, namely the cross entropy method (CEM), for the optimization of the signals in the network, using a (deterministic) user equilibrium assignment model to describe the route choices of drivers in response to any signal timings. The results from the CEM will be compared with those from a genetic algorithm (GA) approach to the same problem, considering the quality of the final solutions obtained from the two approaches and the computational effort required.

The DVD lists the title of this paper as: Cross-Entropy Method for Deterministic Optimal Signalization in an Urban Network.

01329018

11-1946

English

17p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures (10) ; References (18) ; Tables (1)

Entropy (Communications); Genetic algorithms; Optimization; Route choice; Routes and routing; Traffic assignment; Traffic flow; Traffic signal control systems; Traffic signal timing

Traffic network performance; User equilibrium

Highways; Operations and Traffic Management; I73: Traffic Control

Transportation Research Board Annual Meeting 2011 Paper #11-1946

TRIS, TRB

Feb 17 2011 5:59PM