When an oncoming car's high beams are on, is it acceptable to flash your high beams to alert the driver?

Flashing your high beams to alert an oncoming driver that their high beams are on is considered acceptable and can be a courteous gesture. This action serves to communicate with the other driver about a potential visibility issue, allowing them to adjust their headlights and ensure safer driving conditions for both parties. It is important to do this only briefly and not to keep your high beams on, as it can create confusion or temporary blindness for the oncoming driver.

Using high beams when not necessary can contribute to hazardous driving situations, particularly at night or in low visibility conditions. Therefore, alerting the other driver can be a helpful practice to enhance safety on the road.