From: Martin on
"Harry Bloomfield" <harry.m1byt(a)NOSPAM.tiscali.co.uk> wrote in message
news:mn.ad4e7d9c97eabb2c.106911(a)NOSPAM.tiscali.co.uk...
>> What is the correct usage of cab roof lights? On whenever towing or
>> stationary while hooking up the towed car, or more restrictive than that?
>
> Definitely while stationary, when there is a need to give protection to
> the driver whilst working. Probably whilst towing, but definitely not if
> the broken down vehicle has been hoisted onto the back of the truck which
> is able to move just like any other truck.

Ah, yes I suppose you do sometimes see recovery trucks with the lights on
when the recovered car is on the back rather than being towed. Agreed: that
is one time when the lights probably should not be used.

While towing - yes, to warn anyone behind that a) that you are driving at
maximum of 50 mph, may take longer to accelerate and may slow down further
than normal at junctions and bends; b) the vehicle is longer than at first
appearance because there is no gap between the car and the towing lorry
whereas there *might* be if they are two separate vehicles.

OT: Has anyone had the RAC van break down while being towed? When my fan
belt failed, I was towed home by the RAC with the front wheels of my car on
a trolley towed behind the van and the back wheels on the road. Half a mile
from home, that trolley got a flat tyre and the RAC man had to unload my
car, put the spare on the trolley and reload my car. For the sake of half a
mile running on battery and with no power steering, I was tempted to drive
the last bit myself but the RAC man said no.

From: NM on
On 21 Dec, 14:19, "Graham Harrison"
<edward.harris...(a)remove.btinternet.com> wrote:
> "Brown Cat" <br...(a)eye.invalid> wrote in message
>
> news:ktwXm.99807$lP6.80698(a)newsfe13.ams2...
>
> > Every time I see a car being towed the towed car has its hazard lights on
> > whilst being pulled along.  Motorists driving behind it are unable to
> > clearly see the indicator lights of the leading car and can have no idea
> > if the car is going to change direction.
>
> > I don't know why the person sitting in the towed car doesn't just keep
> > their hazards off and uses their indicators to match the leading vehicle.
> > What is the correct thing to do?
>
> Very few people seem to know when/why to use their hazard lights.   An awful
> lot of people seem to use them to indicate that they are parked illegally!

In this situation they are not used a hazard lights thery become
invisibility lights under the sadly mistaken impression that the car
becomes invisible to traffic wardens and police.
From: Brown Cat on
On Mon, 21 Dec 2009 14:19:28 +0000, Graham Harrison wrote:

> Very few people seem to know when/why to use their hazard lights. An
> awful lot of people seem to use them to indicate that they are parked
> illegally!

It's to help traffic wardens spot them more easily.