United States Permit Test Coach
Warning signsQuestion 56 of 223
Yellow diamond with the black words LOW CLEARANCE and a height in feet and inches

What does the number on this sign show?

  1. The lowest height that is clear under the structure ahead
  2. The weight limit of the road ahead
  3. The distance to the next bridge
  4. The highest speed under the structure
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Correct answer: The lowest height that is clear under the structure ahead

A Low Clearance sign shows the real height of the space under a bridge or other structure. If your vehicle is taller, find another route.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 2C.25 Low Clearance Signs (W12-2, W12-2a, and W12-2b), page 213

Practice warning signs

Questions last reviewed: 18 October 2026