Any driver of a vehicle approaching a railroad grade crossing shall stop within not less than 15 feet from the nearest rail of such railroad and shall not proceed further while any of the following conditions exist:
   (A)   A clearly visible electrical or mechanical signal device gives warning of the approach of a railroad train;
   (B)   A crossing gate is lowered or a human flagman signals the approach of a railroad train;
   (C)   A railroad train is approaching within approximately 1,500 feet of the highway crossing and is emitting an audible signal indicating its approach;
   (D)   An approaching railroad train is plainly visible and is in hazardous proximity to the crossing.
(`83 Code, § 8-404)