I. Whenever any person driving a vehicle approaches a railroad grade crossing under any of the circumstances stated in this section, the driver of such vehicle shall stop within 50 feet but not less than 15 feet from the nearest rail of such railroad, and shall not proceed until he can do so safely. The foregoing requirements shall apply when:
      (a) A clearly visible electric or mechanical signal device gives warning of the immediate approach of a railroad train;

Terms Used In New Hampshire Revised Statutes 265:48

      (b) A crossing gate is lowered or a flagman gives or continues to give a signal of the approach or passage of a railroad train;
      (c) A railroad train approaching within approximately 1500 feet of the way crossing emits a signal audible from such distance and such railroad train, by reason of its speed or nearness to such crossing, is an immediate hazard;
      (d) An approaching railroad train is plainly visible and is in hazardous proximity to such crossing.
   II. No person shall drive any vehicle through, around or under any crossing or barrier at a railroad crossing while such gate or barrier is closed or is being opened or closed.