hi, good answer Clive, I found this on the boating forum I use, just about sums up the question -:
" > I seem to remember that it's compulsory to have a numerical speed
sticker on the light board. Is this right, and if so, what should
it be? 60 seems to spring to mind, but I'm sure I've seen 50 ones
too.
>
To the best of my knowledge the advice already given is correct:
speed limits as per Highway Code, i.e. max 50 on single
carriageways and 60 on dual carriageways or motorways, and no need
for a sticker.
The speed sticker still seen on some older trailers is for historic
reasons, and is no longer required.
When I started driving there were only two motorways in the country
(the M1 and the Preston Bypass, the first part of the M6 to open)
and the UK speed limit for towing any sort of trailer anywhere at
all was 30 mph. Imagine an extensive caravan touring holiday with
that limit, or towing a boat from the northwest down to
Cornwall ... Yet we did so, the former quite regularly.
Then in (I think) the very early seventies the limit was lifted to
40 mph.
In about the mid seventies it was further raised to 50 mph, but
this increase was confined to those vehicles which could comply with
certain criteria. Those drivers whose vehicles did comply and who
wanted to avail themselves of the higher limit were required to
display a 50 sticker; for everyone else the limit remained at 40
mph.
This increase was designed to reflect the improvements in design and
handling of caravans and trailers in domestic use - boat trailers
and light luggage trailers - but not to offer the same increase
to, for example, heavy agricultural or builder's trailers.
Consequently most caravans of the day, and most boat trailers and
light luggage trailers duly acquired their stickers.
With the later rise in the limit to 60 mph the restrictions were
dropped, and all trailers once again had the same limits, so
stickers were no longer required.
Nowadays I have the impression that caravanners generally observe
the towing speed limits, but most drivers with lighter trailers
generally do not - and many seem quite unaware not only of the law
but of the fact that in most cases their tyres are rated for use
only up to 100 km/h, i.e. about 62 mph...
Regards,
please note the last paraghrph "how very true"