A flashing red light at a railroad crossing means:

A flashing red light at a railroad crossing indicates that drivers must come to a complete stop and remain stopped until the signals are no longer flashing. This warning system is designed to alert drivers that a train is approaching, emphasizing the potential danger of crossing the tracks. The flashing red lights serve as a clear signal that it is unsafe to proceed, ensuring that vehicles remain clear of the tracks until it is safe to cross.

The other options suggest actions that could endanger drivers or exacerbate risks at the crossing. For instance, proceeding with caution or speeding up could lead to accidents if a train is indeed approaching, while simply waiting for the train to pass without confirming that it is safe could lead to misjudgment of the situation if the signals are still activated. The flashing red light’s primary purpose is to enforce a stop, ensuring safety at a potentially hazardous intersection.