01152301

Component

Quick and reliable estimation of traffic conditions is of critical importance for advanced traffic management systems, especially when heavy congestion occurs. This paper proposes a methodology to predict queue spillovers in city street networks with signalized intersections using data from loop detectors (counts and occupancy). The key idea of the developed methodology is that when spillovers from a downstream link, vehicle arrivals from the upstream signal line, queues discharge at rates smaller than the saturation flow. The paper underlines the significant effect of spillovers in congestion and analyzes an extension of the method to capture variations in vehicle lengths. It also shows that a macroscopic diagram connecting spillovers with car density exists for large scale urban networks which are homogeneously congested. The application of the methodology on an arterial site and the comparison with field data shows that it accurately identifies spillovers in city street networks with signal-controlled intersections.

01147878

10-3498

English

14p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures; Maps; References (13) ; Tables (1)

Highway operations; Highway traffic control; Loop detectors; Signalized intersections; Traffic congestion; Traffic density; Traffic queuing; Traffic signal control systems

Spillback effects (Traffic); Spillover

Highways; Operations and Traffic Management; I73: Traffic Control

Transportation Research Board Annual Meeting 2010 Paper #10-3498

TRIS, TRB

Jan 25 2010 11:46AM