**High beam headlights** or **main beam headlights** are very powerful and are designed to illuminate a great distance ahead of the vehicle. However, this power can cause **glare** to other drivers, especially if the lights are not properly adjusted.

- When an oncoming vehicle has its high beams on, the light can reflect in the **rearview mirrors** of vehicles traveling in the same lane, causing a glare effect that impairs the driver's vision.

- To avoid this problem, it is important to **properly adjust the vehicle's lights**. If the lights are poorly adjusted, they may be too high and dazzle other drivers.

- Additionally, it is advisable to switch to **dipped beam headlights** when another vehicle approaches from any direction, to minimize the risk of glare.


In summary, high beams can cause glare in the rearview mirrors of oncoming vehicles, so it is crucial to keep them well adjusted to drive safely.