00341607

Component

http://onlinepubs.trb.org...s/trr/1981/795/795-004.pdf

https://scholar.google.co...rner&publication_year=1981

A simple and economical method for collecting traffic data at complex urban intersections is described. The technique, developed at the University of Leeds, involves the collection of data in digital form by use of small-format photography taken from a hovering helicopter. The data are obtained in this form by means of a coordinate reader and processed by means of a computer that, using a two-dimensional coordinate transformation system, transforms the data to ground data and outputs information on a range of traffic-flow parameters. These parameters include approach volumes, the origins and destinations of all vehicles followed through the intersection, and the mean journey time and speed for each route. The potential of 16- and 35-mm photography to provide suitable photographic coverage is evaluated. The accuracy of the coordinate transformation systems is determined, and a computer-based coordinate-matching technique is developed. Finally, the accuracy and costs of obtaining traffic data by using the technique are compared with those associated with more conventional ground-survey methods. It was found that, where comprehensive traffic data are required, the technique can provide a simple, accurate, and economical method of traffic data collection and could be a workable alternative to conventional ground-survey methods. (Authors)

Publication of this paper sponsored by Committee on Traffic Flow Theory and Characteristics. 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

01418176

pp 21-24

1981

Transportation Research Record

60th Annual Meeting of the Transportation Research Board

0309032091

Print

Figures (1) ; Maps; References (11)

Accuracy; Approach lanes; Computers; Costs; Data collection; Data reduction; Digital computers; Helicopters; Intersections; Origin and destination; Photography; Speed; Traffic flow; Traffic volume; Travel time; Urban areas

Finance; Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB

Nov 23 1981 12:00AM

• A PROBABILISTIC MODEL OF GAP ACCEPTANCE BEHAVIOR
• DECENTRALIZED CONTROL OF CONGESTED STREET NETWORKS
• ESTIMATION OF TURNING FLOWS FROM AUTOMATIC COUNTS
• IMPROVED ESTIMATION OF TRAFFIC FLOW FOR REAL-TIME CONTROL (DISCUSSION AND CLOSURE)
• MAXBAND: A PROGRAM FOR SETTING SIGNALS ON ARTERIES AND TRIANGULAR NETWORKS
• SENSITIVITY OF FUEL-CONSUMPTION AND DELAY VALUES FROM TRAFFIC SIMULATION