00228423

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http://onlinepubs.trb.org...s/hrr/1973/453/453-003.pdf

THE PURPOSE OF THIS STUDY WAS TO EVALUATE TWO INTERSECTION-DELAY MEASUREMENT TECHNIQUES. AS A RESULT OF AN EXTENSIVE LITERATURE REVIEW, TWO METHODS WERE CHOSEN TO BE THE MOST PRACTICAL FOR FIELD APPLICATION: THE SAGI-CAMPBELL METHOD, WHICH DETERMINES "AGGREGATE" INTERSECTION DELAY FROM MEASUREMENTS OF INFLOW, OUTFLOW, AND LENGTH OF QUEUES AT VARIOUS POINTS DURING EACH CYCLE, AND THE BERRY-VAN TIL SAMPLING METHOD, WHICH MEASURES STOPPED DELAY COUNTS OF THE NUMBER OF STOPPED VEHICLES AT PREDETERMINED TIME INTERVALS. A TWO-LANE INTERSECTION APPROACH IN ARLINGTON,VIRGINIA, WAS RECORDED ON CLOSED-CIRCUIT REAL-TIME TELEVISION AND FILMED SIMULTANEOUSLY ON TIME-LAPSE SUPER-8 MOVIE FILM FOR FOUR 1-HOUR PERIODS. TRAFFIC CONDITIONS VARIED FROM EXTREMELY LOW TO VERY HIGH SATURATED FLOW. DATA WERE EXTRACTED WHILE VIDEO TAPES WERE PLAYED BACK. DELAYS COMPUTED FROM THE TIME-LAPSE PHOTOGRAPHY WERE USED AS BASES FOR COMPARISON OF RESULTS FROM EITHER OF THE TWO TEST METHODS. IN ADDITION, RESULTS BY THE SAGI-CAMPBELL METHOD WERE COMPARED WITH DELAYS MEASURED BY THE TRAFFIC FLOW METER. RELATIONS BETWEEN VOLUME AND DELAY AND QUEUE LENGTH AND DELAY WERE INVESTIGATED. NEITHER ONE OF THE METHODS PRODUCED CONSISTENT TRENDS IN PREDICTING DELAYS AS COMPARED TO THE TRAFFIC FLOW METER OR PHOTOGRAPHIC METHODS USED AS BASES. EVEN THE BASE METHODS FAILED TO GIVE CONSISTENT, DIRECT RELATIONS.

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

Hutter, Jack A; McShane, William R; May, Adolf D; Berry, Donald S

pp 28-48

1973

Highway Research Record

52nd Annual Meeting of the Highway Research Board

0309021863

Print

Figures (14) ; References (9) ; Tables (8)

Flowmeters; Intersections; Measurement; Queuing; Time lapse photography; Traffic delays; Traffic flow; Traffic volume

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
• CHARACTERISTICS OF FREEWAY TRAFFIC AND OF FREEWAY LANE-CHANGING BEHAVIOR
• HEADWAY APPROACH TO INTERSECTION CAPACITY
• INVESTIGATION TO DETERMINE THE CAPACITY OF PROTECTED LEFT-TURN MOVEMENTS