What should you do when you see a sign warning of an upcoming train?

Answer: C — Slow down and yield for trains.

When encountering a sign that warns of an upcoming train, slowing down and yielding for trains is the safest and most appropriate action to take. Train tracks can often intersect with roads in locations that may not have visible train presence until it is too late. By reducing speed, you increase your ability to remain alert to any approaching trains, which can be difficult to see or hear, especially at certain times of the day or due to nearby sounds. Yielding means you prepare to stop if you see or hear a train approaching, thus allowing you the option to safely clear the tracks if a train is coming. This is critical because trains cannot stop quickly, and maintaining awareness at grade crossings is vital for your safety, as well as others on the road. Options that involve looking for a train station or signaling do not effectively address the immediate need to stay safe around train tracks. Stopping at an unnecessary location when the warning sign has not yet indicated immediate danger might cause more accidents due to confusion among other drivers. Thus, the requirement to slow down and yield is a proactive and prudent measure taken for safety around trains.