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Title: TRAFFIC DATA COLLECTION USING VIDEO-BASED SYSTEMS
Accession Number: 00713001
Record Type: Component
Availability: Find a library where document is available Abstract: Sources of bias and variability in the measurement of time-based traffic events by using video recording-and-playback systems are described. Bias can affect accuracy, whereas the lack of precision can increase the minimum sample size. Equations are described that can be used to estimate the adjustment needed to remove bias from the recorded data and to estimate the standard deviation of the measurement process. The equations are sensitive to the method of extracting the individual traffic event times from the videotape. These methods include manual extraction, which uses a frame-by-frame analysis, and automated extraction, which uses a video imaging system to analyze the tape during playback at normal speed. The manual method is found to yield less bias and lower variability than the automated method.
Supplemental Notes: This paper appears in Transportation Research Record No. 1477, Statewide Travel Surveys, Traffic Data Collection, and Urban Travel Patterns. 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
Monograph Accession #: 01399789
Language: English
Authors: Bonneson, James AFitts, Joel WPagination: p. 31-40
Publication Date: 1995
Serial: ISBN: 0309061156
Features: Figures
(6)
; References
(7)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning
Files: TRIS, TRB, ATRI
Created Date: Oct 12 1995 12:00AM
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