Switch to low beams when oncoming traffic is roughly within 500 feet (about 150 meters), unless your local driver’s handbook specifies a shorter distance such as 150 meters / 150 yards.

Safe distance rule

  • Many North American safety guides and dealership resources recommend dimming your high beams when an oncoming vehicle is about 500 feet away.
  • Some official handbooks (for example Ontario, Canada) use about 150 meters as the threshold for switching to low beams for oncoming traffic.

Why this matters

  • High beams can cause dangerous glare, temporarily reducing the other driver’s vision and increasing crash risk, especially at highway speeds.
  • Switching to low beams early gives both you and the oncoming driver more time to react, particularly on curves, hills, or in bad weather.

Extra tips for night driving

  • Dim high beams when following another vehicle at about 200–300 feet so you do not reflect glare into their mirrors.
  • Use low beams in rain, fog, or snow, where high beams can reflect off moisture and actually reduce how far you can see.

If you are studying for a permit/driving test, always memorize the exact number given in your local driver’s handbook, as it can vary slightly by region.

Information gathered from public forums or data available on the internet and portrayed here.