Section 21-702 - All vehicles to stop at certain railroad crossings(a) The State Highway Administration and any local authority with the approval of the State Highway Administration may place a stop sign at any railroad grade crossing of a highway that the local authority or State Highway Administration designates as a particularly dangerous crossing.(b) If the driver of a vehicle approaches the stop sign, the driver: (1) Shall stop within 50 feet but not less than 15 feet from the nearest rail in the crossing; and(2) May proceed only on exercising due care.