When must you dim your high beams?

Dimming your high beams in the presence of oncoming traffic is essential because high beams can blind other drivers, impairing their ability to see the road and react appropriately. When an oncoming vehicle approaches, it is a common safety practice to switch to low beams to prevent causing dangerous glare.

Additionally, when following another vehicle closely, using high beams can create a similar blinding effect on the vehicle in front of you. This can lead to distractions and may affect the driver's ability to operate their vehicle safely.

Thus, both scenarios—encountering oncoming traffic and driving closely behind another vehicle—necessitate the use of low beams to promote safety for everyone on the road.