Virginia Code Title 46.2. Motor Vehicles § 46.2-885. When vehicles to stop at railroad grade crossings

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 flagman gives or continues to give a signal of the approach or passage of a train;

3. A train approaching such crossing gives the signals required by § 56-414;

4. An approaching train or any self-propelled machinery or automobile type vehicle traveling on a railroad track is plainly visible and is in hazardous proximity to such crossing, regardless of whether a clearly visible electric or mechanical signal device or flagman gives warning.