Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

MiC LR Fog Lights

crowdedcat

New Member
May 21, 2021
1
0
London
I got my M3 LR at the end of March this year and am still getting used to doing everything on a touchscreen. In terms of foglights, I have two options for Front and Rear underneath the exterior lights 'buttons' but both fog buttons are greyed out. I have tried turning on the headlights (not the Auto function) but still no fogs. I'm beginning to wonder whether I even have any! But then, if I didn't would the buttons even appear at all?
 

Dilly

Active Member
Feb 24, 2020
1,863
1,527
Norfolk
I got my M3 LR at the end of March this year and am still getting used to doing everything on a touchscreen. In terms of foglights, I have two options for Front and Rear underneath the exterior lights 'buttons' but both fog buttons are greyed out. I have tried turning on the headlights (not the Auto function) but still no fogs. I'm beginning to wonder whether I even have any! But then, if I didn't would the buttons even appear at all?
When you put the headlights on we’re you in drive and did they actually come on?
if they did and fogs were still greyed out, I‘d ring an SC. They can probably sort it over the phone.
 

Yev000

Active Member
May 3, 2019
1,334
909
Knaphill
Never in my entire driving career in UK have I ever needed fog lights. The visibility in the heaviest of fogs I have personally been is has been over 10 meters and regular lights are easily visible.

Maybe in the 70s when lights were poor, special fog lights were required, but now they are just for bling and annoying other drivers behind you.
 

GeorgeSymonds

Active Member
Mar 16, 2018
1,165
718
UK
Never in my entire driving career in UK have I ever needed fog lights. The visibility in the heaviest of fogs I have personally been is has been over 10 meters and regular lights are easily visible.

Maybe in the 70s when lights were poor, special fog lights were required, but now they are just for bling and annoying other drivers behind you.
Generally speaking fog lights aren't for your benefit, but for others to see you.
 

exlatccatsa

Supporting Member
Mar 6, 2020
397
153
Kemnay
Generally speaking fog lights aren't for your benefit, but for others to see you.
"See and be seen"..my motto throughout life. Whether it was sailing, motorcycling, flying hiking, canoeing etc.
Make yourself visible and they won't hit you (motorbike, car, aeroplane) or they'll find you ( hiking, sailing,canoeing).
 
Oct 25, 2016
57
52
Glasgow, Scotland
Never in my entire driving career in UK have I ever needed fog lights. The visibility in the heaviest of fogs I have personally been is has been over 10 meters and regular lights are easily visible.

Maybe in the 70s when lights were poor, special fog lights were required, but now they are just for bling and annoying other drivers behind you.
Meanwhile In Scotland...

I'd never buy a car without front fog lights, mostly for the value of being seen by other drivers, but they're also great for the driver inpicking up things that are off-axis to your headlights in poor visibility. Adaptive headlights can help with that, but foggies are still useful.

A rear fog light is particularly useful in distinguishing the right edge of the car, and carriageway, to drivers behind you, as well as to signify that you're taking extra care and may be driving slower than usual. Not sure if the Model 3 has one, but I'll find out for sure in a couple of weeks :)

I've been in fog that has reduced 50mph single-carriageway roads to a crawl on several occasions.
 
  • Like
Reactions: exlatccatsa

Yev000

Active Member
May 3, 2019
1,334
909
Knaphill
Thought my post would trigger a few poeple....

I still maintain that you can notice a regular car built after 2016 with LED lights w/o fog lights in any fog.
 
  • Like
Reactions: Jez_GB

AndrewGR

Member
Oct 18, 2019
407
196
Oxfordshire, UK
Thought my post would trigger a few poeple....

I still maintain that you can notice a regular car built after 2016 with LED lights w/o fog lights in any fog.
Rear fog lights are brighter than the standard rear lights. I think that means that you must be able to see them from further away in any atmospheric conditions assuming they are the same size. If I have to slow down or stop in thick fog or dense spray, I’d like any following vehicle to see me as far away as possible. Front fog lights were useful when we got fog so thick you couldn’t use headlights at night because of the reflection. Such fog (smog?) is rare these days and I think the main benefit is being seen better in thicker fog. Mostly an affectation though and much less necessary than rear ones in my opinion.
 
  • Like
Reactions: Adopado and Neilio

Yev000

Active Member
May 3, 2019
1,334
909
Knaphill
Rear fog lights are brighter than the standard rear lights. I think that means that you must be able to see them from further away in any atmospheric conditions assuming they are the same size. If I have to slow down or stop in thick fog or dense spray, I’d like any following vehicle to see me as far away as possible. Front fog lights were useful when we got fog so thick you couldn’t use headlights at night because of the reflection. Such fog (smog?) is rare these days and I think the main benefit is being seen better in thicker fog. Mostly an affectation though and much less necessary than rear ones in my opinion.
Front fogs are for the driver, main lights get dispersed and fog lights point down - supposedly providing at least some road illumination.

Rear fog lights are for UN Regulation 48 - specifically to make the vehicle more visible from the rear

The Highway Code gives explicit instruction on when you shouldn't use fog lights, in Rule 236: "You MUST NOT use front or rear fog lights unless visibility is seriously reduced.

And the only place I see them used is in mild rain or spray on the motorway with 100+ meter visibility (or better conditions).




You can speculate how many milliseconds in any given condition a rear fog light would save you from a crash vs no fog light.... But I'd wager it wont be many.
 
Last edited:

AndrewGR

Member
Oct 18, 2019
407
196
Oxfordshire, UK
Yev000 I’m well aware of what the Highway Code says and that front fogs are designed to illuminate the road in front of the car. I can’t see that anyone can doubt that a car with rear fogs on is visible further away than one without in any sort of poor visibility conditions. And I fully accept that many people use rear fogs when they shouldn’t. Unfortunately the opposite is also true - maybe the same people who won’t turn on headlights in poor visibility or only turn on ‘sidelights’. Surely they can see the difference in visibility of oncoming vehicles with and without headlights?
 
  • Like
Reactions: GeorgeSymonds

Alex987854

Member
Aug 30, 2019
226
187
UK
A thing to watch out for is that the fog lights will turn off with the headlights. Caught me out in low cloud with bright sunshine over it. Got high enough up and all the lights went off, still in thick cloud but now invisible from more than a few metres.

It would be better if the fog lights kept the headlights on.
 

AndrewGR

Member
Oct 18, 2019
407
196
Oxfordshire, UK
A thing to watch out for is that the fog lights will turn off with the headlights. Caught me out in low cloud with bright sunshine over it. Got high enough up and all the lights went off, still in thick cloud but now invisible from more than a few metres.

It would be better if the fog lights kept the headlights on.
Shocked to learn that in auto mode the lights will all go off when fog lights are on if it gets brjght. I haven’t experienced this but would consider it a serious bug. Do other cars do the same?
 

Yev000

Active Member
May 3, 2019
1,334
909
Knaphill
maybe the same people who won’t turn on headlights in poor visibility or only turn on ‘sidelights’. Surely they can see the difference in visibility of oncoming vehicles with and without headlights?
I'm not talking about headlights.

A thing to watch out for is that the fog lights will turn off with the headlights. Caught me out in low cloud with bright sunshine over it. Got high enough up and all the lights went off, still in thick cloud but now invisible from more than a few metres.

It would be better if the fog lights kept the headlights on.

Not seen this behaviour. this is from the manual:

"When on, fog lights operate whenever low beam headlights are on. When headlights are turned off, fog lights also turn off."


If you can only turn them on while low beam is on it would be a bit odd if they turn the low beam off... Do you mean high beam?
 

Alex987854

Member
Aug 30, 2019
226
187
UK
If you can only turn them on while low beam is on it would be a bit odd if they turn the low beam off... Do you mean high beam?
Nothing to do with high beam.

I had the fog lights on with headlights set to auto, and on. When the brightness level increased (still in thick cloud) the headlights and fog lights turned off. The driving conditions were essentially the same.

I needed to stop to turn on the lights and then the fog lights. OK on a country road where I was reasonably safe to stop. Wouldn't have been happy about it if it had been somewhere more dangerous.

Fog lights turned on need to override the auto headlights and keep them on.
 
  • Like
Reactions: Yev000

VanillaAir_UK

Supporting Member
Jun 17, 2019
7,975
5,469
Surrey, UK
Its not an excuse, but auto headlight operation notorious for correct operation in fog irrespective of manufacturer. Our previous cars all had warnings about using manual lights in fog. If driving in fog, you probably would be better off using manually controlled lights.

There is certainly a safety and convenience argument that if headlights are on auto and fog lights are turned on, then headlights revert to manual on setting. This will of course revert back to auto next drive though - a different discussion.
 
  • Like
Reactions: Yev000

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top