Citation

Karan MA, Haas R, Kher R. Transp. Res. Rec. 1976; 602: 122-127.

Copyright

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

DOI

unavailable

PMID

unavailable

Abstract

Vehicle speeds on highways as affected by a variety of factors, such as geometric characteristics of the roadway and traffic conditions, have been extensively studied. One factor that has received little attention is that of pavement condition. This report describes a study conducted in the summer of 1974 to develop relationships between average vehicle speed and pavement condition for two-lane highways. The condition factor chosen was roughness, and 72 sites covering a wide range of roughness were selected. Measurements included speed, roughness, geometric characteristics, and traffic counts. Capacities and volume-capacity ratios of the sections were calculated. A regression model relating average speed to roughness in terms of riding comfort index, volume-capacity ratio, and speed limit was developed. The model is simple and plausible and has a reasonable multiple correlation coefficient (0.77).