Exempt Plaque
EXEMPT plaque — white under the Crossbuck, or yellow under the advance warning sign — where buses and hazmat trucks needn't stop.
MUTCD R15-3 (R15-3P) / W10-1a (W10-1aP) · 24 × 12 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the Exempt Plaque
Federal and state rules make school buses, passenger buses and many hazardous-materials trucks stop at every highway-rail grade crossing. Where the state has designated a crossing exempt, MUTCD Section 8B.05 lets an EXEMPT plaque say so: a white R15-3 plaque below the Crossbuck and, where it helps, a yellow W10-1a plaque below the round advance warning sign. Pick the style to match the sign it goes under.