Harold J.
Payne and Stephen Thompson
Ball Aerospace & Technologies Corporation
San Diego, CA
TRB Preprint Paper No. 971113
January 1997
This paper addresses the malfunction characteristics of induction-loop sensors with regard to freeway surveillance applications. Various types of malfunctions are identified, and their respective rates are computed based on data from the Interstate 880 surveillance system in the San Francisco Bay Area. Specific algorithms are presented for diagnosing each malfunction type through inspection of aggregate sensor measurements. Also addressed are methods of "repairing" faulty measurement data, wherein estimates of the actual traffic condition are generated utilizing measurements from adjacent lanes.
key words:
freeway surveillance, induction loop, sensor malfunction
This document is available to the public through the Transportation Research Board, Washington, D.C. 20418.
Last Modified: March 20, 2007
Maintained by: traffic@nmsu.edu
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