1–10 von 10 Ergebnissen
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    Automatic close-following warning sign at Ascot

    Helliar-Symons, R. D. | TIBKAT | 1983

    Count-down signs and Roundel markings trials

    Barker, Judith / Helliar-Symons, R. D. | TIBKAT | 1997

    Automatic speed warning sign - Hampshire trials

    Helliar-Symons, R. D. / Wheeler, A. H. | TIBKAT | 1984

    Masking of brake lights by high-intensity rear lights in fog

    Helliar-Symons, R. D. / Irving, A. | TIBKAT | 1981

    Automatic close-following warning sign : further trials

    Helliar-Symons, R. D. / Ray, S. D. | TIBKAT | 1986

    M1 chevron trial : accident study

    Helliar-Symons, R. D. / Butler, N. R. | TIBKAT | 1995

    Accident reduction and prevention programmes in Highway Authorities, 1987

    Helliar-Symons, R. D. / Lynam, D. A. | TIBKAT | 1989

    Installation and evaluation of Chevron markings on motorways

    Webster, P. B. / Skinner, A. J. / Helliar-Symons, R. D. | TIBKAT | 1992

    Automatic close-following warning sign at ascot

    Helliar-Symons, R. D. | SLUB | 1983
    Beteiligte: Helliar-Symons, R. D.