You must dim your high beam headlights when you are within
- 150 metres of a vehicle ✓
- 200 metres of a vehicle
- 100 metres of a vehicle
- 50 metres of a vehicle
Answer: A. 150 metres of a vehicle
You must dim your high beam headlights when you are within 150 metres of another vehicle.
Why this is the answer
The handbook rule for night driving says high beams must be switched to low beams once you are within 150 metres of another vehicle, whether you are meeting it head-on or following behind it. The same chapter adds a courtesy point: most people misjudge distance, so dim early rather than waiting until you think you are exactly at the limit. The 150-metre figure is the one the handbook attaches to dimming your lights for other traffic.
Why the other answers are wrong
- B. 200 metres of a vehicle — Waiting until 200 metres is not the distance the handbook gives, and holding high beams longer than needed glare-blasts the other driver.
- C. 100 metres of a vehicle — 100 metres is the distance the handbook uses to describe how far high beams light the road, not the dimming distance.
- D. 50 metres of a vehicle — 50 metres is far too close; by then you would already have blinded an oncoming or leading driver.
Remember it
Remember 150 as the dimming distance and 100 as how far high beams reach; the dimming rule is the bigger number.