Headlights are required to be used 1/2 hour after sunset to 1/2 hour before sunrise, when windshield wipers are being used, when visibility is less than 1000 feet, or when there is insufficient light or adverse weather.

By the trunk, remove the floor covering from your trunk. Unscrew the back cover of the headlight unit from your Ford Fiesta. After discovering the rear fog light bulb on your car, remove the burnt-out bulb. Insert your new rear fog light bulb into the headlamp block of your Ford Fiesta.

Pull off the cover. Remove the electrical connector. Turn the bulb anti-clockwise to remove it. Screw the new bulb in clockwise to secure it.

California

• Headlights must be turned on when it’s raining, foggy, snowing, or even cloudy.
• Headlights must be turned on if you cannot see at least 1000 feet in front of you.
• Headlights must be in use from 30 minutes after sunset until 30 minutes before sunrise.

High beams are designed to provide better visibility when driving in rural areas where street lights aren’t common. The water particles from the fog will reflect the light and actually make it more difficult to see. Keep your low beams on so other cars can see you.

TL;DR toggle your taillights a couple times or flash your highs at oncoming traffic to get a flash back. If that doesn’t work, flip the mirror, then distance yourself or let them pass. Some people just don’t know or don’t care that their high beams are on.

It is against the law – with a penalty of $150 – to flash dazzling, confusing or distracting vehicle lights, although police say the law is used sparingly.