00162983

Component

http://onlinepubs.trb.org...s/trr/1976/615/615-009.pdf

http://scholar.google.com...rger&publication_year=1976

In this manual procedure, which is based on several established mathematical and traffic engineering relationships, the total time period of interest (e.g. cycle length) is first divided into a sufficiently small number of equal intervals. Then the vehicles that stop in each interval are tallied separately, and the midpoint of the interval is assumed to represent the average arrivals of the vehicles in the interval. The number of previously stopped vehicles departing is also tallied by interval. The departure of these vehicles is assumed to be randomly distributed in the interval. The results from the above procedure have been compared with those obtained by using time-lapse photography (where frame counts per vehicle were recorded). The theoretical soundness of the model is attested to by its analytic correspondence to the time lapse data. The means and standard deviations are nearly identical, and the correlation between the two procedures are uniformly high. The operational practicality of the method is reflected in a similarly consistent relationship between the timelapse film data and the manual application of the method.

Publication of this paper sponsored by Committee on Highway Capacity and Quality of Service and Committee on Effectiveness of Operational Measures. 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.

01418795

pp 45-46

1976

Transportation Research Record

55th Annual Meeting of the Transportation Research Board

0309025915

Digital/other

References (2) ; Tables (2)

Alternatives analysis; Intersections; Measurement; Time lapse photography; Traffic delays; Traffic signal cycle

Highways; Operations and Traffic Management

TRIS, TRB

Oct 13 1977 12:00AM

• BUS PRIORITY SYSTEM STUDIES USING INSTRUMENTED BUSES (ABRIDGEMENT)
• CAPACITY EVALUATION OF TWO-LANE, TWO-WAY HIGHWAYS BY SIMULATION MODELING
• COMPARISON OF METHODS TO DETERMINE INTERSECTION SERVICE LEVEL (ABRIDGEMENT)
• MEASURES OF PEDESTRIAN BEHAVIOR AT INTERSECTIONS
• MEASURING DELAY BY SAMPLING QUEUE BACKUP
• NONLINEAR TRUCK FACTOR FOR TWO-LANE HIGHWAYS
• PASSENGER CAR EQUIVALENCIES OF TRUCKS, BUSES, AND RECREATIONAL VEHICLES FOR TWO-LANE RURAL HIGHWAYS
• RELATIONSHIP OF SIGNAL DESIGN TO DISCHARGE HEADWAY, APPROACH CAPACITY, AND DELAY
• SPEEDS AND SERVICE ON MULTILANE UPGRADES
• STUDY OF LOCATION BIAS IN SPEED-VOLUME RELATIONSHIPS FOR TWO-LANE ARTERIAL ROADWAYS (ABRIDGEMENT)
• TESTING OF THE TAPESWITCH SYSTEM FOR DETERMINING VEHICLE SPEED AND LATERAL PLACEMENT (ABRIDGEMENT)
• WEIGHING IN MOTION IN CALIFORNIA (ABRIDGEMENT)