LOOK Sign
LOOK with an arrow both ways — the reminder to look for trains, mounted on the Crossbuck post.
MUTCD R15-8 · 36 × 18 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the LOOK Sign
MUTCD Section 8B.16 lets a LOOK sign go on the Crossbuck post or on a separate post nearby, reminding pedestrians and drivers to look both ways for trains. It's black on white, the word under a two-headed arrow. Drawn from FHWA's official artwork.