On 29/03/2021 18:41, NY wrote:
"Steve Walker" wrote in message
...
On 27/03/2021 14:00, Dave Plowman (News) wrote:
In article ,
Â*Â*Â* nightjar wrote:
On 26/03/2021 13:11, jim GM4DHJ ... wrote:
do fog lights and especially rear fog lights require a warning light
that they are on ?

They have done since at least the 1961 lighting regulations, possibly
earlier.

Still doesn't stop plenty idiots leaving them on. ;-)

Not necessarily idiots. Many years ago I took my car for an MOT and
the inspector left the foglights on. Driving home, my dipped
headlights were off, so the foglights didn't come on. The next
morning, driving to work, I needed my dipped lights on and did not
notice that the foglights were on for some time - the switch and
indicator were positioned badly, so they were not easily seen anyway
and were completely hidden by my right arm whilst driving.

How widespread is an interlock between lights switch and foglights, such
the turning off the sidelights resets the fogligh swithc to the off
position.

It is normal on modern cars, but not older ones. Some are electronic and
some are simply by using the same switch for sidelights/headlights and
fog lights.