Final answer:
Drivers should park no less than 15 feet from a fire hydrant. The exact distance may vary by local laws, and the required distance for crossing a road may be subjective and dependent on the conditions of the road and vehicle speeds.
Step-by-step explanation:
The distance required to park away from a fire hydrant can vary by jurisdiction, but a common rule is to park no less than 15 feet (approximately 5 meters) from a fire hydrant. This distance ensures that emergency services have ample room to access the hydrant in the case of a fire.
This precaution is paramount for public safety and is generally mandated by local traffic laws. Concerning the question about crossing the street and car-lengths, as this involves estimation and safety, a general guideline would be that it is safe to cross when there is sufficient distance for a pedestrian to do so without risk, which may be several car-lengths, depending on the specifics of the road and the speed of the approaching vehicle.