Carpool Assignment Technique Application
Publication: Journal of Transportation Engineering
Volume 109, Issue 3
Abstract
A technique to determine the usage of carpools on high occupancy vehicle (HOV) lanes has been developed for the Washington, D.C., region, but can be applied to any metropolitan area. Planning and testing HOV facilities is an important part in performing an alternatives analysis of future transportation systems. The approach is to adjust zone‐to‐zone average car occupancies, which are output from the traditional four‐step transportation planning process, using an observed relationship between HOV travel time savings and increased car occupancies. These “new” average car occupancies can then be used to develop discrete trip tables by vehicle occupancy sizes based on Washington, D.C., data for corridors with and without HOV facilities. These trip tables stratified by vehicle occupancy sizes can then be loaded to a highway network using a traffic assignment computer program called MULTILOAD. This program available through the Metropolitan Washington Council of Governments loads up to four trip tables to a network using capacity restraint based on the total assigned volume, and produces assigned volumes for each carpool size on every link in the network.
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References
1.
Morin, Donald A., “Analysis of the Distribution of Automobile Occupancies,” U.S. Department of Transportation, Federal Highway Administration, Washington, D.C., 1969.
2.
“Carpool Forecasts in the Metro K Line Corridor,” JHK & Associates, for Metropolitan Washington Council of Governments, Washington, D.C., Mar., 1978.
3.
“Extending the Shirley Highway HOV Lanes, A Planning and Feasibility Study,” JHK & Associates, Final Report for Virginia Department of Highways and Transportation, Mar., 1982.
4.
Mann, William W., “MULTILOAD Traffic Assignment,” Metropolitan Washington Council of Governments/Transportation Planning Board, Washington, D.C., Aug., 1982.
5.
“Urban Transportation Planning System (UTPS), Reference Manual,” U.S. Department of Transportation, Urban Mass Transportation Administration and the Federal Highway Administration, Washington, D.C., Apr., 1979.
6.
“Training Course—High Occupancy Vehicle Facility Development Operation and Enforcement,” JHK & Associates, Wagner‐McGee Associates, Inc., The Traffic Institute, Northwestern University, prepared for Federal Highway Administration, U.S. Department of Transportation, Washington, D.C., May, 1981.
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Copyright © 1983 ASCE.
History
Published online: May 1, 1983
Published in print: May 1983
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