What Highway Code Rule 57 Expects of Every Driver With a Dog in the Car

• Highway Code Rule 57 tells drivers to make sure a dog in the car is suitably restrained, so it cannot distract the driver or be hurt in a sudden stop.
• The Code names four ways to restrain a dog: a seat belt harness, a pet carrier, a dog cage or a dog guard.
• Rule 57 has no MUST and no penalty of its own, but the Code can be used as evidence in court, so the harness, crate or guard belongs in the car before the winter trips start.

Rule 57 Has No MUST, but a Court Can Still Use It

Highway Code Rule 57 tells drivers to make sure a dog in the car is suitably restrained, so the animal cannot distract the person driving and cannot injure the driver or itself if the car stops quickly. With dark evenings set in and festive trips coming up, the rule applies to every drive with a dog on the back seat or in the boot, short or long.

The Code, published by the Department for Transport, names four ways to do it: a seat belt harness, a pet carrier, a dog cage or a dog guard. It does not rank them or match them to a breed or a size. The choice belongs to the driver, and the test is the one the rule sets: a dog that is suitably restrained.

The full text of Rule 57 reads: “When in a vehicle make sure dogs or other animals are suitably restrained so they cannot distract you while you are driving or injure you, or themselves, if you stop quickly. A seat belt harness, pet carrier, dog cage or dog guard are ways of restraining animals in cars.” It sits in the Code’s section on rules about animals, one rule after Rule 56, which tells drivers not to let a dog out on the road alone and to keep it on a short lead on the pavement, the road or a path shared with cyclists or horse riders.

What the Code’s Wording Means Once a Case Reaches Court

Rule 57 contains no MUST and carries no reference to a specific law. That separates it from the rules marked MUST or MUST NOT, which the Code’s Introduction describes as legal requirements: break one and the offence can bring a fine, penalty points on a licence or disqualification, and in the most serious cases a prison sentence.

For every other rule, the Introduction says failure to comply will not by itself lead to a prosecution. It adds a second point that applies to Rule 57 directly: a court hearing proceedings under the Traffic Acts can take the Code as evidence when deciding who is liable, and that covers rules written in advisory language such as should, should not, do and do not.

So there is no Rule 57 fine to look up, and no Rule 57 offence to be charged with. What the rule gives a court is the Code’s own statement of what a restrained dog looks like, and the Introduction confirms the Code can go before a court.

Where a Loose Dog Meets the Careless Driving Offence

Distraction is the first reason Rule 57 gives, and distraction is where section 3 of the Road Traffic Act 1988 starts. Headed careless, and inconsiderate, driving, the section makes it an offence for a driver of a mechanically propelled vehicle on any road or public place to act “without due care and attention, or without reasonable consideration for other persons using the road or place”. The offence covers England, Wales and Scotland.

Rule 57 names distraction as the risk it exists to prevent. Whether a particular dog in a particular car amounts to careless driving is a question of facts for a court. What Rule 57 and section 3 show together is why to settle the matter before the engine starts.

Ordinary habits can lead to driving charges in other ways too, as with the heels and boots in the footwell that police can treat as careless driving when the footwear stops a driver controlling the car.

How to Restrain a Dog Before the Winter Trips

The RSPCA states the aim every set-up has to meet: the pet is secure and comfortable, cannot distract the driver, cannot injure the driver or itself in a quick stop, and cannot escape when the driver or a passenger gets out. For cats and small animals the charity wants a strong, secure carrier that is itself fixed in the car so it cannot slide about. The RSPCA also reminds owners that a pet must not be transported in any way likely to cause injury or unnecessary suffering.

For dogs, the insurance comparison site Confused.com goes through the four options the Code names, in a guide updated on 28 September 2026. A boot with a boot guard stops the dog climbing into the passenger area, and blankets on the floor make it comfortable. A crate in the boot or the rear of the car needs anchor straps and enough room inside. A seat belt harness suits nervous dogs and smaller cars, and it has to fit snugly without being too tight; an ordinary dog harness with a seat belt attachment can do the job. Small dogs such as pugs, Chihuahuas and Dachshunds can travel in a carrier secured on the back seat with a seat belt.

Two steps come before the first long drive. The RSPCA advises a few short local trips so a pet gets used to the car and the movement, and to check it is happy with that type of travel. Confused.com says to get a dog used to its restraint before setting off, and to swap a harness for a crate if the harness is the cause of the anxiety, with a blanket in the crate or boot so the dog does not slip.

Two things do not count. Confused.com says a passenger holding a dog is not a restraint, as the dog can wriggle free and distract the driver. On the front seat, the same guide says a restrained dog is allowed there, with the harness on, the passenger airbag off and the seat as far back as it goes, and it still rates the boot or the rear seats as the better place.

Winter Stops Need a Lead and a Plan

Restraint covers the driving. The stops need their own plan. The RSPCA’s advice for long car journeys with a pet is to provide water throughout, feed no sooner than two hours before travelling, and take regular breaks so the dog can exercise and go to the toilet. Dogs should be exercised on a lead, and the driver needs to make sure the dog cannot escape from the car while it is being let out. Rule 56 backs the lead from the Code’s side: a short lead on the pavement, the road or a shared path.

On a winter evening those stops happen in the dark. The RSPCA advises that in dark or dim light a dog wears an LED collar or light so the walker and others can still see it, and that the walker wears a high-vis jacket. Frost adds a second reason to plan the route and the stops; the guide on how to drive on ice and snow sets out the gaps and checks for those roads.

What to Check With the Insurer

Confused.com puts a third consequence on the table, one the Code and the Road Traffic Act do not mention. Matt Crole Rees, Motor General Manager and Motor Insurance Expert at Confused.com, said: “Despite the rules, many drivers still get behind the wheel without properly restraining their dog. But beyond the risk of fines and penalty points, driving with an unrestrained dog jeopardises your car insurance. And, in the case of an accident, your insurer could refuse to pay out.”

That is one comparison site’s view, and none of the official pages cited here covers insurance terms. The way to a firm answer for a particular policy is to read the policy wording or ask the insurer how it treats an unrestrained dog in a claim, before the trip rather than after it.

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Sources

• GOV.UK: The Highway Code, Rules about animals (47 to 58)
• GOV.UK: The Highway Code, Introduction
• legislation.gov.uk: Road Traffic Act 1988, section 3
• RSPCA: Taking Your Pet on Holiday

Reviewed by Preetam Gadekar