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Proceedings / Volume 213 / Issue 40799 / TRAFFIC CONTROL DEVICES AND DATA COLLECTION

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A Single Loop Detector Diagnostic: Mode On‐Time Test

ASCE Conf. Proc. doi:http://dx.doi.org/10.1061/40799(213)99

Applications of Advanced Technology in Transportation
Proceedings of 9th International Conference
Benjamin Coifman1 and Ho Lee2

1Associate Professor, Dept. of Civil and Environmental Engineering and Geodetic Science and Dept. of Electrical and Computer Engineering, Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210; E‐mail: Coifman.1@osu.edu
2Graduate Research Assistant, Dept. of Civil and Environmental Engineering and Geodetic Science, Ohio State Univ., Columbus, OH 43210; E‐mail: lee.2406@osu.edu

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  • Abstract
Loop detectors are the most common vehicle detector for freeway traffic surveillance. Little is done in conventional practice to ensure that the detectors are functioning properly. When validation tests are applied the most common are to check that the detector seems to be counting the correct number of vehicles or that average speeds are reasonable. But such tests rely on aggregate measures across many vehicles and cannot catch many errors in occupancy, a common input to ramp metering. Our group has already shown the benefits of examining individual vehicles at dual loop detectors, this paper extends that strategy to single loops. In particular, we examine the mode on‐time, where the on‐time is the time one vehicle is over the detector. The strategy exploits the fact that at most locations, most vehicles will be passenger vehicles of known length range, and similarly, that most vehicles should be traveling at free flow speeds. Since on‐time is the ratio of a vehicle's length over speed, the mode value at the end of a day should fall within a small range.

© 2006 ASCE

KEYWORDS

ASCE SUBJECT HEADINGS

Traffic signals, Traffic surveillance, Tests

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/40799(213)99

PUBLICATION DATA

ISBN:

0-7844-0799-1

Publisher

ASCE

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