Access onto a national speed limit rural road

A new access onto a derestricted rural road is one of the few planning issues where the highway authority effectively holds a veto. Rural access planning permission turns on visibility, and visibility at 60 miles per hour needs distances that most field boundaries cannot deliver without removing hedgerow. Get the survey work done before you draw the gate.

The sign at the roadside is not the number that matters. What matters is how fast traffic actually travels past the point where your access will sit, measured properly, in both directions.

Why rural accesses attract objections

Country lanes carry a mix of traffic that no urban road does: tractors and trailers at 20 miles per hour, cars at 55, cyclists in groups at weekends, horses, and delivery vans using a satellite navigation route that was never designed for them. Sight lines are broken by hedges, banks and bends.

Highway officers see the same failure repeatedly. A new access is approved on a plan showing splays that exist only if the hedge is cut back to the boundary, the hedge is never cut back, and within two years the visibility has closed to a third of what was approved.

That history explains why rural highway objections are drafted tightly and why officers ask for land ownership evidence over the whole splay. If you cannot control the land, you cannot maintain the visibility.

Measuring speed instead of reading the sign

On a road subject to the national speed limit, the posted limit is 60 miles per hour for cars on a single carriageway. Actual speeds on a narrow lane are often far lower.

The evidence that changes the conversation is a speed survey. Automatic traffic counters left in place for at least seven consecutive days give a distribution of speeds by direction and time of day, from which the 85th percentile wet weather speed is derived. That figure, rather than the limit, is what Manual for Streets 2 expects to drive geometric design on lightly trafficked roads.

Two points decide whether the survey helps you.

Position the counters at the actual access location, not 200 metres away at a convenient straight. Speeds change through a bend, and an officer will notice.

Survey in a neutral period. Counts taken in August, over school holidays or during harvest are open to challenge, and repeating a survey costs less than losing an appeal over it.

Where the recorded 85th percentile comes out at 42 miles per hour on a road signed at 60, the visibility requirement changes materially. Our note on Manual for Streets or DMRB and which applies to your access sets out how highway authorities choose between the two documents.

Visibility at 60 miles per hour

Visibility splays are described by an x distance, measured back from the carriageway edge along the centre of the access, and a y distance, measured along the nearer edge of the carriageway in each direction. The y distance is derived from stopping sight distance at the design speed.

At residential street speeds the numbers are modest. At derestricted speeds they are not. Stopping sight distance in the Design Manual for Roads and Bridges rises steeply with design speed, and for the design speed normally associated with a 60 miles per hour single carriageway the required distance runs to several hundred metres. Check the current DMRB standard rather than a figure from an old file, because the documents are reissued.

The x distance is usually 2.4 metres on a road where traffic speeds are moderate, and highway authorities often ask for more on high speed roads so that a driver can see before the bonnet crosses the carriageway edge.

Three things frequently defeat a splay on a rural road:

1. Third party land. Splays must normally sit within land you own or control, or within the publicly maintainable highway.
2. Vertical alignment. A crest curve can break the sight line even where the plan view looks clear.
3. Growth. Hedges, verges and self-seeded saplings reduce visibility year on year, which is why a maintenance condition or an obligation is routine.

The geometry of x and y distances is covered in more detail in our article on visibility splays and where x and y distances come from.

Hedgerow removal has its own consent

Removing hedgerow to open a splay is not automatically covered by the planning permission.

The Hedgerows Regulations 1997 require a hedgerow removal notice to the local planning authority for most hedgerows of 20 metres or more, or shorter hedgerows meeting another hedgerow at each end, growing on or adjoining agricultural land, common land, a local nature reserve or a site of special scientific interest. The council then has 42 days in which it may serve a hedgerow retention notice if the hedgerow is important under the criteria in the Regulations.

Removal for a planning permission is one of the exemptions in the Regulations, but the exemption is narrow and does not cover clearance you might want for convenience. Check the position before the digger arrives, because removing an important hedgerow without notice is an offence.

Then there is timing. Nesting birds are protected under the Wildlife and Countryside Act 1981, so hedgerow works are usually programmed outside the main breeding season of March to August, or preceded by a check from an ecologist.

Agricultural access rights and their limits

Part 6 of the General Permitted Development Order 2015 permits the formation or alteration of a private way on an agricultural unit of five hectares or more, where it is reasonably necessary for agriculture. A prior approval application covering siting and means of construction goes to the council first.

Two limits catch owners out.

The permitted development right covers the private way on your land. It does not authorise any works within the public highway. Forming a vehicle crossing over a verge or footway requires the highway authority's consent under section 184 of the Highways Act 1980, and larger works to the carriageway need an agreement under section 278.

And the right is for agriculture. Using an agricultural access to serve a converted barn, a holiday let or a commercial storage operation is a change that the highway authority will treat as a new access on a different trip profile, whatever the physical arrangement looks like.

Gates, set-backs and passing places

Gates that open onto the carriageway are refused as a matter of course. The standard requirement is a set-back so that the largest vehicle expected can stand clear of the running lane while the gate is opened, which for a tractor and trailer means considerably more than a car length. Local highway design guides set the figure, and it varies.

Surface the first few metres of the access in bound material. Loose stone migrates onto the carriageway, and section 161 of the Highways Act 1980 makes depositing material on the highway an offence.

Drainage matters as much. Section 163 of the Highways Act 1980 prevents water discharging from premises onto a highway, so the access needs a channel, a grip or a soakaway that keeps run-off on your land.

Where the lane is single track, the highway authority may ask for a passing bay near the access. That request is easier to meet at design stage than after refusal, and it can usually be accommodated within the same hedge line you are already opening.

Upgrading an existing field access

An existing agricultural gateway is a useful starting point and a poor argument on its own. The fact that an access exists does not establish a right to intensify its use.

Where the proposal changes the character or volume of traffic, the highway authority assesses the access as if it were new. Expect to be asked for the same speed survey and the same splays.

The practical route is to set out the existing and proposed movements side by side in a Transport Statement, with the survey data appended and the splay drawing showing land control. On a scheme large enough to reach the thresholds for a fuller assessment, our guide to scoping a Transport Assessment with the highway authority covers what to agree before any modelling starts.

Enter your postcode on PlanScope to see which reports a new rural access is likely to need alongside the highway evidence.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.