Flash your brake lights or turn on your emergency flashers if you:
- Need to warn other drivers of a collision ahead. ✓
- Are temporarily parked in a traffic lane to make delivery.
- Are backing out of a parking space.
Answer: A. Need to warn other drivers of a collision ahead.
Flash your brake lights or turn on your emergency flashers when you need to warn other drivers of a collision ahead.
Why this is the answer
The handbook says that if you can see a collision or hazard ahead, you should warn drivers behind you by turning on your emergency flashers and lightly tapping your brake pedal three or four times. It also says to use emergency flashers if you must stop because of vehicle trouble. The correct choice matches the handbook's warning method for a collision or hazard ahead.
Why the other answers are wrong
- B. Are temporarily parked in a traffic lane to make delivery. — The handbook does not give making a delivery as a reason to use flashers; for vehicle trouble, it says to turn them on and, if possible, pull off the road away from traffic.
- C. Are backing out of a parking space. — The passages cover warning drivers behind about a hazard ahead, vehicle trouble, and following an officer during a traffic break, not backing out of a parking space.
Remember it
Think of flashers and brake taps as a way to tell drivers behind you that something is wrong ahead, not as a parking or backing-out signal.