How far must you stop from a train crossing?

Answer: C — At least 15 feet

The requirement to stop at a train crossing is clearly established to ensure the safety of drivers and passengers. Stopping at least 15 feet from a train crossing allows for sufficient distance to assess the situation; it ensures that a vehicle is far enough away from the tracks to avoid any potential hazards posed by an approaching train. This distance gives the driver ample time to see an oncoming train and react accordingly, thereby reducing the risk of accidents. Stopping further from the crossing also gives pedestrians and other vehicles more space, enhancing overall safety at busy intersections where traffic may overlap with train operations. Given that trains travel quickly and have large stopping distances, this requirement emphasizes vigilant observation and caution whenever nearing level crossings.