Apparatus for monitoring use of a carriageway where the carriageway has two or more lanes 12, 14, 16 for use by vehicles travelling in a single direction A. The apparatus comprises a pair of inductive loops 20abc, 22abc on or in the surface of each lane 12, 14, 16. The loops in the pair are positioned substantially side-by-side across the lane 12, 14, 16 and the pairs of loops 18a, 18b, 18c are positioned substantially side-by-side across the carriageway. Each pair of loops 18abc extends substantially across the full width of the lane 12, 14, 16, and each loop has a length in the direction of vehicle travel which is substantially shorter than the width of the loop across the lane. The apparatus further comprises a loop controller associated with each loop that is operable to energise its associated loop and carry out measurements of inductance. A processing means is also operable to receive inductance measurements from the loop controllers and to calculate an estimate of vehicle positions on the carriageway.
Vehicle detection apparatus
2016-09-07
Patent
Electronic Resource
English
IPC: | G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS |
European Patent Office | 2016
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