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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. Road signs in Puerto Rico - Wikipedia

   en.wikipedia.org/wiki/Road_signs_in_Puerto_Rico

   The MUTCD's W12 series of signs is for warning signs relating to low clearance. W12-1 Double arrow . W12-2 Low clearance . W12-2 Low clearance (metric) W12-2p

5. Clearance (civil engineering) - Wikipedia

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

   In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.

6. Traffic warning sign - Wikipedia

   en.wikipedia.org/wiki/Traffic_warning_sign

   An unusual occurrence of the rectangular arrow sign appears on the eastbound approach to Dead Man's Curve in Cleveland, Ohio, US, a curve so sharp that in places an arrow's stem is printed on one sign and the arrow's point is printed on another larger sign further down the road; from the driver's perspective at a distance, the two signs ...

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