Caravan owners could be slapped with a £1,000 fine and three penalty points if they don't follow the law on towing mirrors.
All drivers towing a caravan must have mirrors allowing them to see clearly.
They'll need to have towing mirrors allowing them to see four metres wide from the side of the caravan, at a distance of 20 metres behind the driver.
Some drivers might just think they'll be fine without mirrors - but that's incredibly dangerous, warned insurance intermediary Caravanwise.
Towing mirrors are relatively cheap - about £20 - compared with the cost of a £1,000 fine, and the added insurance premium of having three points on drivers' licenses.
Half of all caravaners claimed to not know - or simply disregard - the law on mirrors.
There was "absolutely no excuse" for not fitting your vehicle with towing mirrors, and it's vital that all caravan owners keep up-to-date with changes to the law.
Caravanwise said: "Many caravanners treat towing mirrors as something that they can do without but the law says different.
"A caravan is significantly wider than a car even a large 4x4 and you simply can't comply with the law unless you fit towing mirrors.
"Clearly this is potentially a very serious situation and the law treats it seriously.
"If prosecuted you could receive three points on your licence and a £1,000 fine. A motorcyclist knocked off their bike will receive something far more serious and permanent."
But, you could still be breaking the law even after you do buy your towing mirrors.
Every time you detach your caravan or trailer, it's vital that you also take off your towing mirrors.
It's an offense to still be driving with them attached.
