Citation

Ingram JW. Transp. Res. Rec. 1976; 597: 36-37.

Copyright

(Copyright © 1976, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

This paper represents only one step in relieving the pressures of design and maintenance in the field of vehicle detection. The emphasis is placed on enabling the traffic engineer to predict during the design phase whether the system will work with available loop detector amplifiers. Emphasis is also on outlining an exact method of evaluating the sensitivity of a loop and lead in system before the loop detector amplifier is attached to the system. Installation acceptance testing, which includes the measurement of loop resistance, insulation resistance, and inductance, should also include a test for the sensitivity of the loop and lead in system to a standard vehicle or vehicle model. Information on maintenance techniques describes a loop - oscillater, frequency - counter test device and gives procedures and data so that the device can be used to enhance maintenance capability.