Md. Code, Transportation § 21–702

(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.