When is it permissible for drivers to cross the tracks of an unguarded railroad crossing marked by a flashing light?

Flashing red lights at an unguarded railroad crossing serve as a clear warning signal indicating that a train is approaching. It is imperative for drivers to wait until these lights stop flashing before crossing the tracks. The cessation of the flashing red light signifies that it is safe to proceed, as it indicates that no train is currently passing or is about to pass through the crossing.

While some may think they can cross immediately after a train has passed or based on the sound of a train horn, these actions are not reliable indicators of safety. The flashing lights provide the most definitive signal regarding when it is safe to cross. Additionally, the presence of other vehicles is irrelevant; safety at a railroad crossing is not determined by the number of vehicles present but rather the status of the warning signals. Thus, waiting for the flashing red lights to go out is the only correct and safe practice at unguarded railroad crossings.