Research on the Health Index of the Inductive Loop Wire in a Freeway Lane

Since its introduction in the early 1960s, the inductive-loop detector has become the most utilized sensor in a traffic management system. It can obtain the data of traffic flow, occupancy and speed of the road. As a principal component, insulated loop wire is easy to be affected by pavement deformation and environment, so the health status and life of the equipment are easily affected. In order to study the health status of the lane detection devices, a single equipment health index model was proposed. The health status of the inductive loop wire is evaluated according to the results of health index calculation. So as to establish a set of management measures for the loop wire equipment. The health index is calculated by the basic data and the maintenance record of the lane detection equipment in the Beijing to Tibet freeway, so as to complete the health assessment of the loop wire, and make clear its actual operation. The results are in line with the actual situation of the equipment by the verification and evaluation.