Rear fog light mistery
Thread Starter
Member
Joined: May 2022
Posts: 216
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From: USA, IL
Mercedes-Benz C 300 2022 4MATIC
Rear fog light mistery
Is it just one light or must be two? We are having heavy fog in our area and I push rear fog light button. What I see is the bright light on the left side and nothing on the right. Hmm. Manual says fog light. Not lights. Should I plan visit to dealership or it's by design?
Senior Member
Joined: Jun 2022
Posts: 495
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From: Houston TX
2023 C Class
The general idea is for cars behind not to have the impression you are hitting the brakes, hence just one side turns on.
I thought it was forbidden in US because it was not available in any car I’ve owned here before. Maybe the law changed
edit: just found this after a quick google search:
”Rear fog lights aren't mandatory per DOT so most carmakers just exclude the option. It would probably confuse most drivers into thinking you have a faulty brake light that's permanently on because they are so uncommon in the US.”
I thought it was forbidden in US because it was not available in any car I’ve owned here before. Maybe the law changed
edit: just found this after a quick google search:
”Rear fog lights aren't mandatory per DOT so most carmakers just exclude the option. It would probably confuse most drivers into thinking you have a faulty brake light that's permanently on because they are so uncommon in the US.”
Last edited by giovane; Jan 25, 2024 at 11:49 PM.
Thread Starter
Member
Joined: May 2022
Posts: 216
Likes: 22
From: USA, IL
Mercedes-Benz C 300 2022 4MATIC
Junior Member
Joined: Jun 2023
Posts: 56
Likes: 7
C300e
Why was the third brake light invented?
In 1986, the Center High Mount Stop Lamp (CHMSL) – or what we all think of as the “third brake light” – was mandated for use in the United States. The theory, of course, was that a brake light placed higher and more prominently at the back of the car would help to prevent rear-end collisions.17 Sept 2023
In 1986, the Center High Mount Stop Lamp (CHMSL) – or what we all think of as the “third brake light” – was mandated for use in the United States. The theory, of course, was that a brake light placed higher and more prominently at the back of the car would help to prevent rear-end collisions.17 Sept 2023
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Junior Member
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From: Waxahachie, Texas
C300
Is it just one light or must be two? We are having heavy fog in our area and I push rear fog light button. What I see is the bright light on the left side and nothing on the right. Hmm. Manual says fog light. Not lights. Should I plan visit to dealership or it's by design?
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Joined: Dec 2019
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Is it just one light or must be two? We are having heavy fog in our area and I push rear fog light button. What I see is the bright light on the left side and nothing on the right. Hmm. Manual says fog light. Not lights. Should I plan visit to dealership or it's by design?
Newbie
Joined: Dec 2025
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Interesting point about how something as small as a rear fog light can draw police attention—many drivers really overlook these details. It’s a good reminder to stay aware of vehicle rules and how they’re enforced. For anyone curious about traffic-related cases or how such issues are officially handled, checking resources like Spartanburg Traffic Court can be helpful. Situations like this show how everyday driving habits can quickly turn into formal matters. Staying informed definitely saves time and stress later.
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2026 GLC300 4Matic (X254)
I also thought I read somewhere once that it is only on one side for parking on side of the road reasons. In some places in Europe, some cars are half on road, half on sidewalk. And those lights help with something? Not sure what. Every MB I've ever had has had the rear fog standard. I believe my SAABs did too. U.S. spec cars here.
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I also thought I read somewhere once that it is only on one side for parking on side of the road reasons. In some places in Europe, some cars are half on road, half on sidewalk. And those lights help with something? Not sure what. Every MB I've ever had has had the rear fog standard. I believe my SAABs did too. U.S. spec cars here.
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Joined: Apr 2002
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From: Diamond Bar, CA
W206 PHEV AMG
Just a design choice. Audis have two rear fog lights at least on the SUVs. EU allows if you have one or two fog lights, but if you only have one, it must be on the driver side.
