Citation

Opiela K, Datta TK, Randolph D. Transp. Res. Rec. 1976; 615: 18-19.

Copyright

(Copyright © 1976, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

he results are presented of a speed-volume study in which the locations were selected on the basis of similarities in traffic, abutting land use, geographic location, roadway features, and traffic control. Spot speed and volume data were collected at each location for each direction of traffic flow. The speed and volume data points were plotted, and curves were hand-fitted through the points for each study site. The study found that for volumes up to 800 vehicles/h on 2-lane arterials, the speed-volume relationships of similar roadway locations lie within a narrow speed band having a width of 4.8 km/h (3 mph). Beyond 800 vehicles/h the speed-volume curves are influenced by the type of abutting land use. The more intense is the land use, the lower is the speed-volume relationship. The variations in speed-volume curves attributable to location bias are small, given 2-lane arterials and abutting land uses. Hence location bias can be ignored for practical application in the design of traffic control systems.