You must stop for a school bus:

  1. That is parked on the shoulder of the road with no one in it.
  2. When it approaches you, even if its lights are not flashing.
  3. If you are both driving on a two-lane highway and its red lights are flashing. ✓
  4. Whenever the driver waves at you.

Answer: C. If you are both driving on a two-lane highway and its red lights are flashing.

You must stop for a school bus when you approach it from either direction on a two-lane highway and its red lights are flashing.

Why this is the answer

The handbook says that if you approach a school bus from either direction and it is showing alternately flashing red lights, you must stop. You stay stopped until the bus moves again, the driver signals you to go, or the red lights stop flashing. The flashing red lights are what trigger the duty to stop, so a bus driving toward you on a two-lane highway with those lights on is a bus you must stop for.

Why the other answers are wrong

Remember it

Watch the red lights, not the bus itself: flashing red means stop, and you wait until they quit flashing or the driver waves you on.

Official handbook: Texas Driver Handbook (DL-7), Chapter 4: Right-of-Way , p. 23

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.