Walkthrough: a new access onto a classified road

Forming a new vehicular access onto a classified road needs planning permission. The permitted development right in Part 2 Class B of the GPDO covers the formation of an access to a highway, but only where that highway is not a trunk road or a classified road, and only where the access serves other permitted development. An A, B or C road takes you straight to an application, and the highway authority becomes the consultee whose view decides it.

What follows is an illustrative walkthrough of that application, built from the pattern these cases usually follow rather than from any particular property. The figures are illustrative and are there to show the method.

The site and why an application was needed

A detached house on a plot fronting a B road on the edge of a village, with an existing narrow access serving a single garage and a second frontage of about 20 m. The owner wanted a second access to serve a new parking and turning area, so that vehicles could leave in forward gear rather than reversing onto the road.

No permitted development right applied, for two reasons. The road is classified, and the access was not required in connection with any other permitted development. A householder planning application was the only route, with a separate licence needed later under section 184 of the Highways Act 1980 for the works in the highway itself. Those are two different consents from two different parts of the council, and the licence cannot be granted before the planning permission exists.

Visibility splays and the speed survey

The highway authority's first question is always the same: what can a driver emerging from the access see, and is it enough at the speed traffic actually travels.

Visibility is expressed as an X distance back from the carriageway edge and a Y distance along it in each direction. Manual for Streets sets 2.4 m as the normal X distance in built-up areas and derives the Y distance from stopping sight distance, which is 43 m at 30 mph. Where the posted limit understates real speeds, the authority will ask for a speed survey and take the wet weather 85th percentile speed as the design basis instead.

In this case the frontage sat just inside a 30 mph limit, close to the point where the limit changes. A seven-day automatic traffic count recorded wet weather 85th percentile speeds above the posted limit, so the authority asked for visibility derived from the measured figure rather than from the sign. That single decision moved the required Y distance well beyond 43 m in one direction and set up the objection that followed.

Hedge removal inside the splay

The splay ran across the frontage hedge, a species-rich boundary of hawthorn, field maple and hazel on an earth bank. Three separate issues arrived at once.

The hedge was potentially an important hedgerow under the Hedgerows Regulations 1997, which would mean serving a removal notice on the council and waiting for its response before any work. The bank supported a mature ash within the splay, which needed checking against the Tree Preservation Order register. And removal during the bird nesting season would risk an offence under the Wildlife and Countryside Act 1981.

The resolution was to lower rather than remove: the hedge was reduced to 900 mm within the splay and maintained at that height by condition, with the bank retained. Vegetation below 600 mm is the usual test for what counts as an obstruction, and 900 mm was accepted here because the ground level inside the splay sat below the carriageway. Where a tree is involved, a tree survey recording the root protection area is worth having before you commit to a splay position, because a splay that clips a root protection area creates a second problem.

Surface water running onto the highway

Highway authorities object to accesses that discharge water onto the carriageway, and they have the powers to back it up. The design had to show that surface water from the new drive would be intercepted before the highway boundary.

Three elements did the work: a channel drain set 500 mm inside the boundary connected to a soakaway, a gradient falling away from the road for the first 6 m, and a bound surface for that same first 6 m so that loose gravel could not be carried onto the carriageway. The soakaway was sized on a percolation test rather than an assumption, and the calculation sat in a short drainage note rather than a full Drainage Strategy, which would have been disproportionate for a domestic access.

The highway authority's first response

The initial consultation response objected. It cited inadequate visibility in the southbound direction, no evidence that the land needed for the splay was within the applicant's control, and no detail of surface water interception. It also questioned whether a second access was needed at all when one already existed.

That last point is the one householders find hardest. A highway authority will often prefer one well-designed access to two mediocre ones, and "the existing access is substandard" is a better argument than "I would like another".

Design changes that resolved it

Four changes turned the objection around.

1. The new access moved 4 m north, which bought visibility in the constrained direction by clearing the corner of the bank.
2. The existing substandard access was closed and reinstated as verge, so the scheme delivered a net reduction in conflict points on the frontage.
3. A land registry title plan confirmed that the full splay in both directions lay within the applicant's ownership and the highway verge, with no third party land involved.
4. The drive was widened to 4.8 m for the first 10 m to allow two vehicles to pass clear of the carriageway, and a turning area was drawn to a template rather than sketched.

The revised consultation response withdrew the objection subject to conditions. Closing the old access was what made the difference, and it is the trade that works more often than any other on a frontage with an existing substandard entrance.

The submitted pack

The application comprised a site location plan at 1:1250, an existing and proposed block plan at 1:200, an access detail drawing at 1:100 showing splays dimensioned in both directions, a swept path drawing for a family car and a refuse vehicle at the frontage, the speed survey data, a short drainage note with the percolation test results, a hedgerow and tree note, and a Transport Statement covering the access geometry, the parking provision and the closure of the existing entrance.

A short Planning Statement tied it together against the development plan and the relevant highway policies. On a householder application of this kind no statement is required. It is still where the "net safety benefit" argument lives, and that argument is what the officer copies into the report.

Conditions attached to the permission

The permission came with the conditions these applications usually attract: the access to be constructed and the visibility splays provided before first use, the splays to be kept free of obstruction above 600 mm in perpetuity, the existing access to be permanently closed and the verge reinstated before the new one is brought into use, the first 6 m to be surfaced in bound material, surface water to be intercepted before the highway boundary, and any gates to be set back 5 m from the carriageway edge and to open inwards.

The section 184 licence followed the permission, with the works carried out by an approved contractor and inspected by the highway authority. Budget for that separately. It is a highways charge, not a planning fee, and it is not covered by the application fee.

This is general guidance rather than legal advice, and visibility standards are applied by individual highway authorities on the facts of each frontage, so check the position with your local planning authority or a qualified professional before relying on it.

PlanScope can draft the statements that sit behind an access application, structured to UK planning policy and flagged where survey data is still needed. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.