What must you do when approaching a railroad crossing with flashing lights?

When approaching a railroad crossing with flashing lights, the correct action is to come to a complete stop and wait for the lights to turn off. This is a crucial safety measure designed to protect drivers and passengers. The flashing lights indicate that a train is either approaching the crossing or may already be on the tracks, and stopping allows you to assess the situation safely.

The lights serve as a warning system to prevent accidents. Ignoring the lights by slowing down and trying to cross quickly can lead to disaster if a train is indeed coming. Similarly, looking for trains and proceeding if clear or driving through if the tracks appear clear do not account for the speed of trains, which can be deceptively fast and are often quieter than expected. Always adhering to the stop signal when the lights are flashing is essential for ensuring safe passage at railroad crossings.