Motorists approaching a school bus stopped with its red signal lights flashing must stop unless...?

Answer: C — The road is divided by a median

When a school bus has its red signal lights flashing, it means that children are either getting on or off the bus. This is an important safety measure to ensure that the children are able to cross the street safely. Therefore, all motorists must come to a complete stop unless the road is divided by a median. Option A is incorrect because the speed limit does not matter when it comes to stopping for a school bus. Option B is incorrect because, regardless of which lane a motorist is in, they must stop for a school bus. Option D is incorrect because the presence of a loading zone is irrelevant when it comes to stopping for a school bus.