Which of these is a proper use of vehicle lights?

Question

Accepted Answer

Flashing your brake lights to warn someone behind you that you are slowing down.. Section 2.4: Tap the brake pedal a few times to flash your brake lights to warn drivers behind you that you are slowing down.

Answer

Using high beams in fog.

Answer

Turning off headlights at dusk to save the battery.

Answer

Using hazard lights while driving at the speed limit.