The effect on vehicle speed of advisory speed indications shown on motorway signals has been measured at two sites on the M1 motorway. On an urban section of the motorway at Scratchwood in N London, measurements were made of vehicle speeds before and after a set of signals mounted over the carriageway on a gantry. The signals were set to show an advisory speed of 50 mile/h. Control measurements were also made with the signals switched off. The average speed of light vehicles in the right-hand lane was reduced from about 78 mile/h to 71 mile/h (9 percent); in the center lane from about 69 to 63 mile/h (7 1/2 percent); and in the left-hand lane from about 57 to 55 mile/h (4 percent). Similar measurements were made on a rural section of the motorway at Newport Pagnell where the single signals are mounted on posts in the central reservation. The average speeds of light vehicles in the right-hand lane was reduced from about 77 mile/h to 69 1/2 mile/h (9 1/2 percent); in the center lane from about 68 to 63 mile/h (7 percent); and in the left-hand lane from about 55 to 52 mile/h (5 percent).


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    Title :

    The Effect of Motorway Signals on Traffic Speed


    Contributors:
    C. J. Lines (author)

    Publication date :

    1978


    Size :

    21 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    The effect of motorway signals on traffic behaviour

    Lines, C. J. / Transport and Road Research Laboratory, Crowthorne | TIBKAT | 1981



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    Engineering Index Backfile | 1959