Citation

Munjal PK, Hsu YS. Highw. Res. Rec. 1973; 453: 10-27.

Copyright

(Copyright © 1973, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

This paper gives a detailed account of important freeway traffic characteristics based on an analysis of aerial photographic data obtained on the long island expressway and the ventura and the santa ana freeways. These freeway traffic characteristics include time headway distribution, time speed distribution, space headway distribution, space speed distribution, space relative speed distribution, and bivariate histograms of space speed and relative space speed with space headways. This information was obtained for every lane and for various levels of traffic service and is presented both in graphical and in summary table forms. The report also gives an account of the nature of various traffic characteristics distributions and relates the bivariate histograms to safe driving rules. Also reported are microscopic aspects of lane-changing behavior obtained from the long island data.

DISCUSSIONs and summary statistics were made for the speeds, space headways, and relative speeds of the lane-changing vehicle and its neighboring vehicles. This was done for each lane and for levels of service b and c; some interesting relations were found among the different variables. Three risk criteria were applied that provided hazard measures of lane changes.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/hrr/1973/453/453-002.pdf

Language: en

Keywords

TRAFFIC SURVEYS; HIGHWAY SYSTEMS - Planning; PHOTOGRAMMETRY