Inductive Loop Detectors: Theory and Practice

摘要

This implementation Package provides a users manual for design application and performance testing of inductive loop detector systems developed by the Department of Traffic, City of Los Angeles, California. It is based on a study of many of their approximately 3,000 loop detector field installations. The purpose of the study was to determine the causes of failure or intermittent operations and to develop aids for the design, test, and maintenance of these systems. Basic theory of loop detector operation is also presented along with a discussion of loop size and shape. Installation procedures used in the Urban Traffic Control System (UTCS) in Washington, DC, are presented with other discussions of practical ways to deal with the installation of loops across pavement joints. A detector trouble-shooting procedure, with detail instructions and data recording forms, is presented in an Appendix in a form suitable for removal and use by individual technicians.