Towing a caravan or trailer is one of the most demanding driving tasks a private motorist can undertake. Done correctly, it is safe and straightforward. Done incorrectly, it is one of the most common causes of serious motorway incidents in the UK. Whether you are towing a caravan for the first time or looking to brush up on the rules, this guide covers everything you need to know — from legal requirements and weight limits to handling, reversing, and what to do when things go wrong.
Your entitlement to tow depends on when you passed your driving test. If you passed after 1 January 1997, your standard Category B licence allows you to tow a trailer with a Maximum Authorised Mass (MAM) of up to 750kg, or a heavier trailer provided the combined weight of the towing vehicle and trailer does not exceed 3,500kg and the trailer does not exceed the unladen weight of the towing vehicle. To tow heavier combinations, you need a Category B+E licence, which requires an additional practical test. If you passed before 1 January 1997, you are generally entitled to drive vehicle and trailer combinations up to 8,250kg MAM. Check your licence photocard carefully — the entitlements are listed on the back. You must also ensure your towing vehicle is legally roadworthy, that the trailer has a valid number plate matching the towing vehicle, and that all trailer lights are functioning correctly before every journey.
The single most important factor in safe towing is the ratio between the weight of the towing vehicle and the weight of the loaded trailer. As a general rule, the loaded trailer should not exceed 85% of the kerbweight of the towing vehicle — this is known as the 85% rule. Exceeding this ratio significantly increases the risk of snaking (see below). Never exceed the manufacturer's stated maximum towing capacity for your vehicle, which is found in the owner's manual or on the vehicle identification plate. The nose weight — the downward force the trailer exerts on the towball — must also be within the manufacturer's limits, typically between 50kg and 100kg. Too little nose weight causes the trailer to snake; too much puts excessive strain on the rear axle and reduces front-wheel grip. Use a nose weight gauge before every trip.
A trailer that becomes detached at motorway speed is catastrophic. Before every journey, work through the following checks systematically. Ensure the towball coupling is fully engaged and the locking mechanism is secure — give the caravan a firm upward lift to confirm it cannot detach. Attach the breakaway cable or secondary coupling to the towing vehicle's dedicated anchor point, not to the towball itself. Connect all electrical cables and check that all trailer lights — indicators, brake lights, sidelights, and reversing lights — are working correctly. Check tyre pressures on both the towing vehicle and the trailer, including the spare. Ensure the trailer is loaded with heavier items low and over the axle, not at the rear. Check that all hatches, lockers, and doors on the caravan are secured. Finally, check your mirrors — you will need extended towing mirrors if the trailer is wider than your vehicle's mirrors, and in the UK it is a legal requirement to have adequate rear vision.
When towing a trailer or caravan, different speed limits apply to those for solo vehicles. On a motorway or dual carriageway, the maximum speed is 60 mph (not 70 mph). On a single carriageway, the limit is 50 mph (not 60 mph). In built-up areas, the standard 30 mph limit applies. These limits apply regardless of what the road signs show — the lower towing limit takes precedence. On motorways, vehicles towing trailers are prohibited from using the outside lane of a three-lane (or more) motorway. You may use the middle lane to overtake, but must return to the left lane as soon as it is safe to do so. These rules are enforced by cameras and police, and a fixed penalty notice can be issued for violations.
Snaking — also called yawing — is the side-to-side oscillation of a trailer that, if uncorrected, can cause the towing vehicle to lose control entirely. It is most commonly triggered by excessive speed, crosswinds, the bow wave of a passing lorry, an incorrectly loaded trailer, or an overloaded trailer relative to the towing vehicle. The correct response to snaking is to ease off the accelerator gently and do not brake — braking can amplify the oscillation. Hold the steering wheel firmly and straight, and allow the combination to slow naturally. Do not attempt to steer against the snake. Many modern caravans are fitted with a Trailer Stability Programme (TSP) or similar electronic stability system, which applies the trailer's brakes automatically to damp the oscillation. If your caravan snakes repeatedly, it is a sign that the loading or the tow vehicle ratio needs to be addressed before continuing.
Reversing with a trailer is counterintuitive and requires practice. When you turn the steering wheel left, the trailer goes right, and vice versa. A useful technique is to place your hand at the bottom of the steering wheel — moving your hand left steers the trailer left, and moving it right steers the trailer right. Use your extended towing mirrors and, where possible, have a banksman (a person on the ground) to guide you. Reverse slowly and in short increments, making small steering corrections rather than large ones. If you lose sight of the trailer or feel uncertain, pull forward and start again — attempting to recover a badly angled reverse often makes things worse. Practice in an empty car park before attempting to reverse onto a pitch or into a tight space.
Towing in adverse weather significantly amplifies the risks described above. In crosswinds, a caravan presents a large surface area and is highly susceptible to being pushed sideways — reduce your speed well below the legal limit and be especially vigilant when passing bridges, gaps in hedgerows, and large vehicles. In heavy rain, stopping distances increase substantially — a loaded caravan combination at 60 mph in wet conditions may need over 100 metres to stop. Reduce your speed and increase your following distance to at least six seconds. In fog, the trailer's rear lights may be obscured by condensation — check them before setting off and pull over to clean them if necessary. In icy conditions, towing is strongly inadvisable unless absolutely necessary; the combination of increased weight, reduced grip, and the trailer's tendency to push the towing vehicle make control extremely difficult.
If you break down while towing, the same principles apply as for any motorway or road breakdown — switch on hazard lights, move to the hard shoulder or a place of safety if possible, exit from the left side, and stand well away from the carriageway. However, recovering a vehicle and trailer combination requires specialist equipment and experience. Not all recovery operators are equipped to recover a caravan or trailer, and an inexperienced operator can cause significant damage to both the towing vehicle and the trailer. Black Eagle Recovery provides specialist caravan and trailer recovery across London and the South East, 24 hours a day, 7 days a week. Our operators are experienced in towing combinations and will recover both your vehicle and your trailer to your preferred destination. Call 0330 520 1620 for immediate assistance.
Broken down while towing a caravan or trailer? Black Eagle Recovery provides specialist 24/7 caravan and trailer recovery across London and the South East. Call 0330 520 1620 — we have the equipment and experience to recover both safely.
Call 0330 520 1620Leave your details and we'll call you back.
Breaking down on a motorway is one of the most dangerous situations a driver can face. This step-by-step guide covers how to get to safety, what to do on a smart motorway, how to call for help, and how to get recovered quickly.
Involved in a road traffic accident? This step-by-step guide covers the immediate actions to take, how to exchange details correctly, gathering evidence, reporting to your insurer, dealing with uninsured drivers, and when to call for vehicle recovery.
Ice, fog, heavy rain, and high winds each demand a different approach. This guide covers how to drive safely in every adverse weather condition, how to handle aquaplaning, how to prepare your vehicle, and when to pull over and call for help.
Black Eagle Assistant
24/7 · Instant answers
AI assistant · For emergencies call 0330 520 1620