Final answer:
The safe distance to stand from train tracks when a train is traveling at 100 mph is typically 15 feet, though it can vary by area and is subject to local safety regulation and signage.
Step-by-step explanation:
The question relates to safety protocols concerning an appropriate distance to stand away from train tracks when a train is traveling at high speeds, specifically 100 mph (160 km/h). The general guideline is to stand a safe distance away from the tracks, not only due to the high speed of the train and the possibility of air turbulence but also to protect against any potential debris that might be thrown up by the train's motion. Safety recommendations typically suggest a minimum distance of 15 feet from the edge of the railroad ties to ensure sufficient clearance from trains. However, these recommendations can vary by jurisdiction and railroad company, so it's always best to observe any posted signs or warnings in the vicinity of the tracks to ensure compliance with local rules.