Storage Space Sign
How much room there is to wait between the tracks and the highway — the symbol or the word signs.
MUTCD W10-11 / W10-11a / W10-11b · 36 × 36 / 30 × 36 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the Storage Space Sign
Where a road crosses the tracks just before meeting a highway, there may only be room for a car or two between them. MUTCD Section 8B.18 lets the Storage Space signs warn drivers: the W10-11 symbol, or the word signs W10-11a (the distance between the tracks and the highway ahead) and W10-11b (between the highway and the tracks behind you). The word signs carry FHWA's sample distance, 100 FEET. Drawn from FHWA's official artwork.