“It's illegal,

I brought it up the other day in a different topic.

In reduced visibility or impaired visibility you have to use your lights.
Under 300 ft (not yards) - 100 metres ish. - you may use your rear Fog Light.

If you have front fog lights (contrary to popular belief most cars don't - most have low level additional driving lights which make driving in fog easier as they don't illuminate fog but illuminate the ground around the vehicle). Then you can use these on open roads in any kind of reduced visibility but not in towns where lighting is provide and you must show courtesy to other drivers.

Main beam is not advised in heavy fog or mist as it illuminates the fog.

But yes - I completely agree - And if you have an accident your insurance will not pay out.
That should be enough for most people to think about putting them on.”

“Maybe people just forget to put their lights on sometimes. I find that if I flash my lights at a car coming the other way which hasn't got it's lights on and then look in my rearview mirror as it's driven by me, the lights usually go on pretty quickly. So the drivers aren't driving without lights on purpose!”

“Lights should be on x”

“dcrane - everyone makes mistakes I agree - forgetting to use lights is the very reason daytime running lights are now law on new cars. But for those with older cars - simply forgetting to use your lights it's not really a good defence if you are involved in an accident as a result.”

“In the same way as those people who never get around to replacing faulty bulbs..”