Hydroplaning is usually caused by:
- Excessive stops.
- Sudden stops.
- Sudden turns.
- Excessive speed. ✓
Answer: D. Excessive speed.
Hydroplaning is usually caused by excessive speed.
Why this is the answer
The handbook explains hydroplaning as the vehicle sliding on a thin layer of water between the tires and the road, so the tires lose contact and you can skid. It lists low tire pressure or bad tread as things that raise the risk, and it says speeding does too. That makes excessive speed the cause named in the choices. The passage also tells you to slow down in rain and increase following distance, which fits the same idea: keeping speed down helps your tires stay in contact with the road.
Why the other answers are wrong
- A. Excessive stops. — Frequent stops are not described as a hydroplaning cause; the handbook ties the risk to the water layer, tire condition, and speed.
- B. Sudden stops. — Sudden stops are not listed as the cause; wet roads increase stopping distance, but the handbook does not say hard braking creates hydroplaning.
- C. Sudden turns. — Sudden turns are not the cause; the handbook discusses sharp steering as overcorrection that can lead to a rollover or steering into traffic.
Remember it
Picture the tires riding on a film of water, and ask whether your speed is making that film harder to cut through.