W10-4 TRAIN CROSSING AND INTERSECTION ADVANCE WARNING (symbol) Sign - Railroad Warning Signs
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Railroad Crossing Advance Warning Signs, W10-1
FHWA - MUTCD - 2003 Edition Revision 1 Chapter 8B
Skewed Crossing? Illegal road signs in the Castro? – offtracksanfrancisco
Traffic Signs
Railroad Signage Archives - National Electric Gate Company
Traffic Signs
Manual of Traffic Signs - W10 Series Signs
Railroad Crossing Advance Warning Signs, W10-1
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