No Train Horn Sign
NO TRAIN HORN — for crossings in a quiet zone, where trains don't sound their horns.
MUTCD W10-9 (W10-9P) · 24 × 18 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the No Train Horn Sign
Locomotive engineers sound the horn approaching a public crossing — except in a quiet zone, where other safety measures replace it. MUTCD Section 8B.14 puts a NO TRAIN HORN sign at those crossings so drivers don't wait for a horn that won't come. Table 8B-1 sizes it as a 24 × 18 in yellow sign; the 2009 edition made it the W10-9P plaque below the advance warning sign. Draw it as a plaque or as a diamond.