Just because you are paying more attention to it when passing. If you had someone watch your pupils, they would get bigger when passing, I'll bet.
Farther away!
That is the dash light dimmer control switch.. Rheostat = Dimmer. Bright to dim.
Turn on headlights/parking lights and adjust dimmer control
One of the things to do is if your ceiling fan is being operated by a dimmer, set the dimmer to the highest setting to stop it from humming or replace the dimmer switch with a regular wall switch.
How bright a star appears depends on both its actual brightness and how far away it is. The farther away a star is, the dimmer it appears. A bright but very distant star many therefore appear dimmer than a less bright star that is closer to us.
Its the dimmer switch bad.
This is usually an indication that the dimmer switch is in need of replacement.
the dimmer rehostat is faulty..if you drive with the dash on full bright all the time anyway you can jump out the dimmer by jumping the two end wires on the dimmer plug
A beam of light becoming dimmer is a physical change since it is reversible. Recharging its source will make the light beam bright again.
You need to check your dimmer switch it is bad or not plugged in correctly.
Check the bulbs first, then the dimmer switch and wiring.
Inadequate ground connection!