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Inductance Loop Detector Lead Length
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1994-09-01
[PDF-1.44 MB]
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Edition:Interim: September 1993-August 1994
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Abstract:Reducing congestion in our nation's urban areas has become a top priority nationwide for state departments of transportation. The recent development and construction of freeway management systems have begun to help reduce these problems. A major component of freeway management systems is the inductance loop detector. This research effort evaluated the use of inductance loop detectors in a freeway management situation to determine maximum permissible lead lengths. Using several detector units, researchers evaluated lead lengths with five different design vehicles (large and small passenger cars, a pickup truck, a motorcycle, and a high-profile truck). Both passenger cars and the pickup truck were always detected with 1,220 meters (4,000 feet) of lead wire on all combinations of sensitivity level and number of wire turns. The detection of the motorcycle and high-profile truck depended upon the sensitivity level and number of wire turns used. The data also indicate that detection of the passenger vehicles may be possible at distances much greater than 1,220 meters (4,000 feet). An extrapolation of the inductance measurements indicates that detection of passenger vehicles at 2,440 meters (8,000 feet) is likely, and detections may even be possible at much larger distances. Lead lengths of this magnitude give the designer greater flexibility in producing the most functional and cost-effective design.
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