How far must you stop from a railroad crossing when a train is approaching?

Answer: B — At least 15 feet

When approaching a railroad crossing and a train is approaching, it is crucial to stop at least 15 feet away from the tracks. This distance is designed to maintain a safe buffer zone between your vehicle and the train, allowing for ample space to avoid potential accidents. The 15 feet distance gives you enough room if the train is moving at high speed, and it provides visibility for both the driver and the train engineer. Stopping too close to the tracks can lead to hazardous situations where the driver may not have adequate time to react to an incoming train or may become stuck at the crossing if their vehicle is too close. Ensuring a minimum distance of 15 feet is a standard safety practice that allows for proper reaction time and reduces the risk of being involved in a collision with a train.