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.


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    Title :

    Vehicle detection apparatus


    Contributors:

    Publication date :

    2016-09-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS




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