Citation

Eash R. Transp. Res. Rec. 1993; 1394: 42-48.

Copyright

(Copyright © 1993, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

Traffic forecasts were prepared by the Chicago Area Transportation Study (CATS) for a proposed high-occupancy vehicle (HOV) lane in northeastern Illinois as part of a Stevenson Expressway HOV lane feasibility study. The traffic assignment procedure developed for this project is outlined. Problems encountered in adapting traffic assignment to highway networks with HOV lanes are first presented. Then, network equilibrium concepts are used to illustrate driver behavior when an HOV lane is available. It is concluded that an equilibrium traffic assignment procedure may be applied to HOV lane traffic assignment. Remaining sections of the paper deal with particular issues in applying the HOV lane traffic assignment in the Stevenson Expressway project. Coding of different HOV lane alternatives in CATS traffic assignment network is discussed and network coding for a concurrent HOV lane illustrated. Trip tables are adjusted for altered mode and vehicle occupancy choices caused by the time savings between the HOV lane and general purpose expressway lanes. The HOV lane traffic assignments were accomplished with software from the Urban Transportation Planning System. The resulting HOV lane traffic assignment procedure is only slightly more complex than normal equilibrium traffic assignment.

RESULTS from one of the project's HOV lane traffic assignments are reported in the final section.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1993/1394/1394-006.pdf

Language: en

Keywords

Traffic control; Highway traffic control; Street traffic control; Highway systems