1. (a) when an audible or clearly visible electric or mechanical signal device gives warning of the immediate approach of a train;
2. (b) when a crossing gate is lowered or when a human flagman continues to give a signal of the approach or passage of a train;
3. (c) when a train approaching within approximately 1,500 feet of the crossing emits a signal audible from such distance and such train, by reason of its speed or nearness to such crossing, is an immediate hazard;
4. (d) when an approaching train is plainly visible and is in hazardous proximity to such crossing; and

5. (e) when a crossing gate is in the process of being opened or closed.

   No person, except a Metro-North employee acting in the course of his duties, may cross Metro- North train tracks other than at a railroad crossing maintained for public use by Metro-North or at a private crossing established pursuant to statute or written agreement with Metro-North.

No person shall traverse any railroad crossing: