How should you signal to oncoming drivers with their high-beam headlights on?

Flashing your high-beam headlights is an effective way to signal to oncoming drivers who have their high-beam headlights on. This action alerts them that their bright lights are causing glare and may be impairing your visibility. Using your high-beams to flash back serves as a friendly reminder for them to reduce their brightness for safety reasons. It's a common practice that helps maintain safe driving conditions, as improved visibility for all drivers is crucial, especially at night or in low-light situations.

Other methods, such as tapping your brakes, turning off your headlights, or driving off the road, may either not effectively communicate your message or could lead to dangerous driving conditions or confusion on the road. Flashing your lights specifically addresses the situation in a direct and understand-able manner.