Final answer:
It is true that a motorist should not stop or park in front of a driveway unless directed by a police officer for legal and safety reasons.
Step-by-step explanation:
A motorist should indeed never stop or park in front of a public or private driveway unless directed by a police officer. This is true because blocking a driveway can hinder access to property and potentially obstruct emergency vehicles or other critical services from performing their duties. It's an example of how traffic laws are enforced, and these laws are generally designed to maintain order and safety on public roads. A police officer, under their legitimate authority, can instruct a driver to move or stop in a certain way for public safety purposes, but such an officer does not have the authority to order a driver to perform personal tasks unrelated to law enforcement, such as home-related chores.