00228422

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http://onlinepubs.trb.org...s/hrr/1973/453/453-002.pdf

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.

Sponsored by Committee on Highway Capacity and Quality of Service. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01410366

pp 10-27

1973

Highway Research Record

52nd Annual Meeting of the Highway Research Board

0309021863

Print

Figures (5) ; References (10) ; Tables (11)

Aerial photography; Freeways; Headways; Highway operations; Histograms; Level of service; Physical distribution; Spacing; Traffic; Traffic safety; Traffic speed; Weaving traffic

Freight Transportation; Highways; Operations and Traffic Management

TRIS, TRB

Feb 27 1974 12:00AM

• ANALYSIS OF THE TRADE-OFF BETWEEN LEVEL OF LAND ACCESS AND QUALITY OF TRAFFIC SERVICE ALONG URBAN ARTERIALS
• EVALUATION OF INTERSECTION-DELAY MEASUREMENT TECHNIQUES
• HEADWAY APPROACH TO INTERSECTION CAPACITY
• INVESTIGATION TO DETERMINE THE CAPACITY OF PROTECTED LEFT-TURN MOVEMENTS