Yes, towing mirrors are a legal requirement under UK law whenever a trailer is wider than the towing vehicle or blocks the driver's view behind.
What the law says
The Road Vehicles (Construction and Use) Regulations 1986 and the Highway Code set out the rules for towing mirrors in the UK. The DVSA (Driver and Vehicle Standards Agency) enforces these regulations on behalf of the government.
The rule is straightforward: you must have adequate mirrors that allow you to see behind your vehicle at all times when towing. If the trailer is wider than the towing vehicle, or if it blocks your natural line of sight to the rear, you are legally required to fit towing mirrors. This applies whether you are towing a small utility trailer, a horse box, a caravan, or any other type of trailer.
Our full guide to towing mirrors under UK law explains the regulations in detail and covers the options available to you.
What counts as adequate mirrors
Adequate mirrors means you must be able to see the road behind and to the sides of your outfit. A single mirror on each side of the towing vehicle is rarely sufficient when towing, because the trailer changes the vehicle's profile and can create blind spots.
The law does not specify one type of mirror as the only legal option. Instead, it requires that your setup gives you an unobstructed view. This can be achieved with:
- Clip-on or magnetic towing mirrors that attach to your existing wing mirrors
- Replacement wing mirrors with extended arms
- Extendable or telescopic mirrors that fold out when towing
- Additional mirrors fitted to the trailer itself
The choice depends on your vehicle, the trailer you are towing, and the frequency with which you tow. If you are hiring a trailer from a local provider, confirm which mirrors are already fitted and whether additional ones are needed for your vehicle type.
Penalties for non-compliance
Driving without adequate mirrors when towing can result in a fine of up to GBP 1,000 and penalty points added to your driving licence. Police officers and DVSA examiners have the power to stop you and check your mirrors during a towing operation.
Beyond the legal risk, inadequate mirrors are a safety hazard. Towing without a clear view of the road behind makes it harder to spot other vehicles, cyclists, and pedestrians, increasing the risk of accidents.
Practical checklist before you tow
Before setting out to tow a trailer, use this checklist to make sure you are compliant:
- Check the width of the trailer against the width of your towing vehicle
- Look in all mirrors and confirm you can see the road behind and to the sides
- Test the mirrors from the driver's seat to ensure they give a clear, unobstructed view
- Make sure any clip-on or magnetic mirrors are secure and will not move during driving
- Check that mirrors are clean and free from damage or cracks
- If in doubt, fit additional towing mirrors before you drive
Finding a trailer with the right mirrors
When you hire a trailer, ask the hire company which mirrors are fitted and whether they meet legal requirements for your vehicle. If you are buying a used trailer or hiring one for the first time, confirm that mirrors are included or budget for them separately.
Whether you are looking for trailer hire options locally or need equipment for a one-off job, GetBrent connects you with rental companies and sellers across the UK who can advise on the right setup for your needs and ensure all legal requirements are met before you leave.
