Development and Evaluation of Co-ordinated Re-routing and Signalling in Congested Urban Street Networks



Development and Evaluation of Co-ordinated Re-routing and Signalling in Congested Urban Street Networks

Authors

CREMER M and REIMERS S, Technical University Hamburg-Harburg, Germany

Description

Congested networks are a serious problem in urban sites. To increase the effective use of the overall capacity of urban street networks and to inhibit oversaturation the European project COSMOS develops and tests new congestion management strategies. The

Abstract

Congested networks are a serious problem in urban sites. To increase the effective use of the overall capacity of urban street networks and to inhibit oversaturation the European project COSMOS develops and tests new congestion management strategies. The means for those strategies are rerouteing via VMS interacting with dynamic signal control. Within the project a test site is established in the greek harbor town Piraeus. This test site has its specific problems with a large amount of traffic going through the city to reach or leave the ferry boats piers.

In this paper we present by simulation the potential of a coordinated control scheme in scenarios near or beyond saturation. The use of rerouteing via VMS diverts traffic flows and by that influences the signal control to reflect the change of flows in the duration of green time for the alternative routes used for rerouteing. As an approach to visualize the effects fiom rerouteing and dynamic signal control a macroscopic dynamic traffic flow simulator is used. In addition the simulator periodically calculates the traveltimes on different routes and uses these results to determine a new set of rerouteing recommendations. An acceptance rate for those recommendations is assumed and new traffic flows are calculated. Effectiveness of this coordinated control scheme is performed using travel times on relevant routes in the network.

Publisher

Association for European Transport