Low Ground Clearance Sign
The low ground clearance symbol — a hump at the crossing that can strand a low trailer on the tracks.
MUTCD W10-5 · 36 × 36 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the Low Ground Clearance Sign
A crossing that sits high above the road on either side can catch a low-slung trailer or bus and leave it stuck on the tracks. MUTCD Section 8B.17 lets the W10-5 symbol sign warn of it, often with the LOW GROUND CLEARANCE plaque (W10-5P) below. Drawn from FHWA's official artwork.