eduzhai > Applied Sciences > Engineering >

Backpressure Control with Estimated Queue Lengths for Urban Network Traffic

  • Save

... pages left unread,continue reading

Document pages: 13 pages

Abstract: Backpressure (BP) control was originally used for packet routing incommunications networks. Since its first application to network trafficcontrol, it has undergone different modifications to tailor it to trafficproblems with promising results. Most of these BP variants are based on anassumption of perfect knowledge of traffic conditions throughout the network atall times, specifically the queue lengths (more accurately, the trafficvolumes). However, it has been well established that accurate queue lengthinformation at signalized intersections is never available except in fullyconnected environments. Although connected vehicle technologies are developingquickly, we are still far from a fully connected environment in the real world.This paper test the effectiveness of BP control when incomplete or imperfectknowledge about traffic conditions is available. We combine BP control with aspeed density field estimation module suitable for a partially connectedenvironment. We refer to the proposed system as a BP with estimated queuelengths (BP-EQ). We test the robustness of BP-EQ to varying levels of connectedvehicle penetration, and we compared BP-EQ with the original BP (i.e., assumingaccurate knowledge of traffic conditions), a real-world adaptive signalcontroller, and optimized fixed timing control using microscopic trafficsimulation with field calibrated data. Our results show that with a connectedvehicle penetration rate as little as 10 , BP-EQ can outperform the adaptivecontroller and the fixed timing controller in terms of average delay,throughput, and maximum stopped queue lengths under high demand scenarios.

Please select stars to rate!

         

0 comments Sign in to leave a comment.

    Data loading, please wait...
×