Is there actually any prohibition from using them on certain types of road.
I though the only rule was the obvious one of "turn off rear fog lights when
the following car is so close that it will be dazzled by them"? I tend to
keep my rear fog lights on in fog if I can't see any lights behind me, and
turn them off when I can see the headlights of the car behind (on the
grounds that when I can see him, he is probably close enough to be dazzled
by my fog lights).
Embarrassingly, I spent the whole of one journey religiously turning what I
thought were my fog lights off and on depending on whether I could see
anything behind me, only to discover at the end of my journey that I'd been
turning on/off the adjacent switch - for my heated rear window ;-) That was
on an old Mark II Golf where there were three rocker switches on the
dashboard - one for fog lights, one for heated rear window and one for
something else - unlike the modern trend of putting the fog light switches
as a pull-out on the on-dashboard light switch (modern VWs) or as a collar
on the light-switch stalk (most other cars I've driven).
I don?t if it has been made a regulation but it does seem the normal
arrangement on more modern vehicles. It has certainly cut down on the
number of cars seen with a rear fog lamp still on some time after
conditions needed them.
It wasn?t unusual to see a car being driven weeks or even months after the
last time the lamp was needed ,now on a more up to date vehicle the effect
of such forgetfulness* will only last till next time the vehicle is shut
* or unawareness and ignorance of the extra warning light showing
somewhere on the dashboard for weeks.
I think the longest I went with one on was for about two miles on a Ford
Escort where the light was put somewhere as an afterthought as it was
designed in originally on that model a MK2 I think it was.
It had been turned on by the MOT tester and not turned off, subsequently I
always checked and found the same after a couple of MOT tests. It was
almost as if they did that as some sort deliberate party trick.
I've not come across any cars which reset the state of the foglights when
the engine is switched off.
I have come across cars which reset it when the side light switch is turned
off - sometimes as a mechanical interlock in the switch - which achieves the
same purpose: that it is impossible for the foglights to come on (without
deliberate human action) next time the lights are turned on.
I think I'd spot the foglight reminder lamp when I did my "cockpit drill"
every time I start the car - scan the dashboard for unexpected lights, check
for fuel level, check that oil and ignition lights *do* come on when the
ignition switch is turned on and go out when the engine is running, etc. But
I'm probably unusual in doing that quick check - and the old waggle of the
gear lever before starting, to prove to myself that it's in neutral, which
saves the car lurching forwards if I've left it in gear.
But I know what you mean about lights in inaccessible places. The worst was
on my mum's old Renault 14 where the temperature gauge and warning light
were on the centre console in front of the gear lever - not the sort of
place that you routinely scan with your eyes while driving. My sister
knackered the engine when a radiator hose blew and the temperature went
sky-high... but she didn't see the gauge/light. Mum was not pleased, but she
agreed that it was a very understandable thing to miss.
Rather than tutting, perhaps you'd like to point me to the exact
regulations. OK, so I omitted to say "only use them when it's foggy",
because I thought that was blindingly obvious, though many people seem to
use them even when it's completely clear (not even light mist).
Is there something in the highway code about classes of road or its speed
limit which regulates when they may or may not be used, despite thick fog,
subject always to the "don't dazzle" rule.
I have 10 plate van that turns the fog lights off with the ignition (but
will start up with the headlight on) and a 62 plate car that I have no
idea what happens with them as I have never used them other than to
check the lamps work.
This has always puzzled me. Tail lights are at the extremities of your
vehicle so as to define its width to a vehicle that is approaching from
behind so it can judge how far away it is from you. In fog, tail lights
cannot be seen from very far away, so rear fog lights serve the same
purpose. So there need to be two of them, co-located with the tail lights.
But no, most cars only have one, on the offside. On my previous (older)
cars, there was a bulb holder and red housing on the nearside, wired in. All
it needed was to put a bulb in there and I had two foglights. But my present
car only has a red housing on the offside (for a fog light) and only has a
white housing on the nearside (for a reversing light). It's not just a case
of fitting missing bulbs to give two foglights and two reversing lights.
When I'm reversing into a narrow opening between two gateposts, it is very
useful to have reversing lights on *both* sides, so they light up *both*
gateposts. In the absence of two reversing lights, I usually put on my rear
foglight as a (red) reversing light to light the offside.
On my eighth car since 1991, all of them switch off rear (and front)
fogs when the ignition is switched off. Last car that had a toggle
(latching switch) was an 1984 Open Manta GT/E.
Current and previous car have automatic headlights and pressing the
front or rear fogs will cause the headlights to come one if they are
off. I haven't tried with the headlights in manual to see how the fogs
work. No point have automatic headlights if you don't use them.
Current car has lights in the instrument cluster for fogs. Previous had
lights in the switches. But when the steering wheel was in the best
position for me, the fog switches and light switches were obscured. You
couldn't see if the fogs were on without moving about to see past the
wheel. They switched off anyway so poor attention meant they weren't on
My pickup has a mechanical interlock on rear fogs. You need headlamps on
for rear fog and switching off headlamps also switches off fogs. Leaving
the lights on and removing the key starts the bongs and beeps of doom.
Mines does, and the previous two (but they were both Disco II's). Not
sure if M reg Mondeo before them did.
Not tried that. B-) Hopefully you can turn the headlights off and
retain the front driving lights. Have to do that fairly often coming
over the tops in hill fog, too much bounce back from dipped
headlights to have them on.
B-) I like mine but even though switching the car off resets the
state of the fog and driving lights to off it doesn't reset main to
dipped. So when they automatically come on next time they can come on
in main beam. As I'm almost invariable on main beam when I arrive
home at night, I have to remember to manually cancel that. Automatic
things are good, provided they get it right...
Two reversing lights should be standard.
Also, when switching to LHD countries, the HIRF is on the wrong side.
Sometimes, even if there are two sockets for HIRF, actually fitting a second one will trigger the light failure/checking - it will see too much current and report as a fault.