Question

If a driver behind you has their high beam headlights on, make sure that your rear-view mirror is in the ____________ setting.

Answer 1

I believe the answer is: night vision setting

Night vision settings is made by reflecting rear surface is tilted out of line with the driver's view. This being done in order to avoid piercing light to the eyes of drivers that most likely caused them to momentarily blinded and increase the chance of collision.