What should you do at a railroad grade crossing when directed by a flagman or stop sign?

When you approach a railroad grade crossing and are directed by a flagman or a stop sign, you should stop at the crossing. This is essential for safety, as train traffic can be unpredictable and fast-moving. A flagman is there to ensure that vehicles do not cross the tracks when it is unsafe to do so, typically because a train is approaching. Similarly, a stop sign indicates that you need to halt your vehicle and check for trains before proceeding.

Stopping allows you to have a clear view of the tracks in both directions and gives you time to listen for any train whistles or warnings. It's crucial to obey these signals to prevent accidents, as trains can arrive suddenly and can be difficult to see approaching until they are very close. Therefore, stopping at a railroad crossing when instructed by a flagman or stop sign is not just a rule but a vital safety measure.