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  2. Tell-tale (bridges) - Wikipedia

    en.wikipedia.org/wiki/Tell-tale_(bridges)

    A tell-tale warning of a low clearance over a road. A tell-tale, also known as a bridge warning, is a series of ropes suspended over railway tracks to give warning to the engineer, and more importantly the brakeman who may be scampering across the tops of the cars, that the train is approaching a low-clearance obstacle, such as a tunnel or a bridge.

  3. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    Toggle Warning signs subsection. 4.1 W1 series: Horizontal alignment. ... W12 series: Low clearance warnings. W12-1 Double arrow. CW12-1 Double arrow. W12-2

  4. Clearance (civil engineering) - Wikipedia

    en.wikipedia.org/wiki/Clearance_(civil_engineering)

    The clearance for overhead signs is 5.7 metres (18 ft 8 in) and the clearance for the soffit or underside of overpasses is 10 metres (32 ft 10 in). [ 6 ] In South Africa and the southern region of Africa, the minimum vertical clearance of modern bridges is 5 metres (16 ft 5 in), although the legal height limit of road vehicles is still at 4.3 ...

  5. Manual on Uniform Traffic Control Devices - Wikipedia

    en.wikipedia.org/wiki/Manual_on_Uniform_Traffic...

    Australian warning signs have a yellow diamond with a black legend, following America's practice. Australia remains the only country that still has the text-based version of the low-clearance signage. (Most other countries now use vertical arrows in between the clearance height.)

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  7. Traffic warning sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_warning_sign

    A warning sign is a type of sign which indicates a potential hazard, obstacle, or condition requiring special attention. ... May also indicate low ceiling clearance.

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