Final answer:
No one should park within typically 50 feet of the nearest rail of a railroad crossing, which could be roughly estimated as 3 car-lengths using an average car length of 15 to 18 feet.
Step-by-step explanation:
The question pertains to traffic laws and safety regulations regarding the distance at which vehicles must park from a railroad crossing. Such laws are enacted to ensure safety by providing clear visibility for both train engineers and motorists approaching the tracks.
The exact distance required by law varies by jurisdiction, but a common guideline is that no one should park within 50 feet of the nearest rail of a railroad crossing. This is to provide adequate sight lines for drivers and to prevent any impediments to a train's path.
To determine how many car-lengths this distance represents, you'd need to know the length of the vehicle in question. A typical car might be approximately 15 to 18 feet long, so roughly 3 car-lengths would be a safe estimate for 50 feet.