There are two main roads across Dartmoor and neither behaves like anything most visitors have driven before. The B3212 runs from Moretonhampstead through Postbridge and Two Bridges to Princetown and on toward Yelverton. The B3357 crosses from Tavistock through Dartmeet to Ashburton. Between them they carry almost everyone who comes to the moor.
They are also, for long stretches, entirely unfenced, which is the single most important thing to understand before setting off.
Unfenced Means Exactly What It Says
On much of the moor there is no barrier of any kind between the tarmac and the common land either side. Ponies, cattle and sheep graze up to and across the road, and they have right of way in practice if not in statute.
The scale of this is not theoretical. Dartmoor Forest Parish Council has described the 3.5 mile stretch of the B3212 between Peek Hill and Princetown as unfenced, subject to a 40mph limit, and running across Walkhampton Common where around 150 cattle and 80 ponies roam freely.
Collisions are frequent. The Dartmoor Livestock Protection Society recorded 117 collisions involving animals on the moor in 2021, and as the parish council put it, most result in the death of the animal and heavy damage to the vehicle involved, with some also causing injury to drivers and passengers.
Karla McKechnie, Dartmoor’s livestock protection officer, has described these unfenced roads as death traps unless motorists are animal aware. That is not tourist board language. It is the person who attends the incidents.
The Livestock Are Not Where You Expect Them
Two specific behaviours catch visitors out, and neither is obvious.
Animals stand on the road rather than beside it, particularly at night and in poor weather, because the tarmac holds heat. A dark pony standing still on a dark road at dusk is very close to invisible until you are on it.
And a wall or fence along one side of the road means nothing. Livestock cross at gaps, gates and cattle grids, and a fenced verge on the left tells you nothing about what is coming from the right.
There has been a genuine effort to address this. More than 200 animals along the B3212 between Peek Hill and Princetown have been fitted with reflective neckbands, funded through the Vision Zero South West road safety partnership, and vehicle activated speed signs have been installed, including one below Leedon Tor.
The neckbands help. They do not substitute for driving at a speed that lets you stop.
Stopping Distance Is the Whole Question
Which brings the practical point into focus. Everything about driving safely on unfenced moorland comes down to how quickly the car stops when something appears in front of it.
At 40mph on a wet Dartmoor road, that distance is longer than most drivers estimate, and it depends heavily on the four contact patches between the vehicle and the surface. Tread depth determines how much water can be cleared; below about 3mm, wet braking performance falls away well before the 1.6mm legal minimum is reached. Pressure affects both grip and how the car behaves in a sudden swerve.
Checking tread and pressures before a moorland trip takes five minutes. If either is marginal, dealing with it at home is considerably easier than discovering the problem at Two Bridges, and comparison services such as Tyres.co.uk list fitting centres across Devon along with mobile fitting in some areas, which suits a trip that starts early. On roads where the hazard genuinely does step out from nowhere, the condition of the tyres is the only part of the stopping equation the driver fully controls.
Fuel is the other pre-departure item. Filling stations on the moor itself are scarce, and the sensible approach is to fill up in Tavistock, Okehampton, Moretonhampstead or Ashburton rather than assuming somewhere will appear.
If You Do Hit an Animal, You Are Legally Obliged to Report It
This catches visitors out and the consequences are serious.
Under the Road Traffic Act 1988, a collision involving livestock, which includes horses and ponies, must be reported to the police as soon as reasonably practicable and in any event within 24 hours. Failure to do so is an offence carrying substantial penalties.
Devon and Cornwall Police have publicly noted a gap between the number of animal deaths reported by livestock owners and the number of collisions reported by drivers, which means a significant share of incidents go unreported.
The other reason to report is that an animal walking away from a collision is not necessarily uninjured. If you hit something, call it in even if it appears fine, so somebody can check.
Fog Is the Condition Nobody Plans For
Dartmoor generates its own weather, and moorland fog can reduce visibility to a few metres in the time it takes to drive from Two Bridges to Postbridge.
It is not seasonal. Clear conditions at Tavistock tell you very little about conditions at 400 metres on the open moor, and the transition can happen within a mile.
The practical response is unglamorous: slow to a speed that suits what you can actually see, use dipped headlights rather than main beam, and resist the urge to press on because the map says it is only another four miles. Livestock do not become more visible in fog, and the road edges frequently have no markings.
Where to Actually Stop
The moor rewards stopping, and doing it properly matters because verges are soft and passing places are not parking spaces.
Postbridge has the medieval clapper bridge, a genuine landmark rather than a scenic layby, with a car park and the National Park visitor centre. Dartmeet, where the East and West Dart rivers converge, has parking and is one of the few places you can get to water easily. Haytor, on the eastern edge, has substantial car parks and is the most accessible tor for anyone not planning a serious walk.
Princetown, high on the moor and dominated by the prison, has the main visitor centre and is the practical stopping point on the B3212. Widecombe-in-the-Moor, Chagford and Ashburton are the villages worth building a day around rather than driving through.
What does not work is stopping on the road itself for a photograph of a pony. Sightlines on the moor are deceptive and following traffic arrives faster than it appears to.
Check the Firing Ranges Before You Plan a Walk
One Dartmoor-specific detail that surprises first-time visitors: parts of the northern moor are used as military training ranges, and access is restricted when firing is taking place, indicated by red flags or lights at range boundaries.
This affects walking rather than driving on the main roads, but if the plan involves parking and heading out on foot in the Okehampton area, check the published firing times before setting off rather than after arriving.
Plan Around the Roads, Not Around the Miles
Distances on Dartmoor are short and journey times are not. A route that measures twenty miles can take well over an hour once you account for single-track sections, gates, livestock, gradients and the fact that you will want to stop.
Build a day around two or three places rather than six, allow considerably more driving time than a map suggests, and treat the road between stops as the point rather than the overhead.
That is genuinely what makes Dartmoor different from most national parks. The driving is not the way you get to the experience. Done at the right speed, with the car in the right condition and an eye on what is standing in the road ahead, it is the experience.
