Title 40, Chapter 6, Section 140
(a) Whenever any person driving a vehicle approaches a railroad
grade crossing, such driver 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, when:
(1) A clearly visible electric or mechanical signal device gives
warning of the immediate approach of a train;
(2) A crossing gate is lowered or a human flagman gives or
continues to give a signal of the approach of the passage of a
(3) An approaching train is plainly visible and is in hazardous
proximity to such crossing.
(b) No person shall drive any vehicle through, around, or under any
crossing gate or barrier at a railroad crossing while such gate or
barrier is closed or is being opened or closed.