SYSTEM FOR OVERVAKNING AV EN VEG GENOM INDIKERING AV NERVARON AV FORDON INOM DET AKTIVA OMRADET FOR GIVARE

摘要

A route or a section thereof is monitored by sensors distributed therealong which are identical and are triggered sequentially one from another after a certain delay in each case, the first of these sensors being triggered by a master pulse. The responses from the sensors which indicate the presence of a vehicle are retransmitted to a control device through the preceding sensors. The sensors comprise each a miniature transmitter and a miniature receiver which are slightly coupled to each other when in operation, the coupling being intensified in the presence of a vehicle in the operating zone of a sensor.