Citation

McShane WR, Lieberman EB. Transp. Res. Rec. 1980; 772: 18-23.

Copyright

(Copyright © 1980, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

The effect of left-turning vehicles on approach capacity has been observed and studied, but a complete model has been lacking. As part of the development of the TRAFLO simulation model for the Federal Highway Administration, the capacity of a signalized intersection approach was modeled. The most complex component of this capacity model, that for left-turn lanes, is discussed. Three basic types of intervals for the vehicle discharge process are identified, and the probabilities of each are found. Expressions for expected vehicle discharge per cycle and for saturation flow rates per hour of green are reported. Reasonable results have been obtained.