When National Highways objects to an application
The strategic highway authority can stop a council issuing a permission. What triggers an objection, what a direction restricting the grant means, and how the evidence is put right.
A National Highways objection to a planning application is not an ordinary consultee comment. The organisation manages the motorway and trunk road network on behalf of the Secretary of State, and where it cannot accept a scheme it can ask the council to refuse, or have the grant of permission restricted so the council is unable to issue the decision at all. Committees do not override it.
For a developer, the practical consequence is that the transport evidence has to satisfy a second authority with its own standards, its own modelling expectations and its own programme, alongside the local highway authority. The two do not always want the same things.
What the strategic road network covers
The network is the motorways and the trunk A roads, the ones carrying long distance and freight traffic. Everything else, including most A roads, sits with the county, unitary or London borough as local highway authority.
Proximity is not the test. A site can be two miles from the nearest junction and still engage the network if the traffic it generates routes through that junction, and a site adjoining a trunk road may not engage it at all if access is taken from a side road and trips distribute away. Working out whether the strategic road network is engaged is the first question, and it is answered by trip distribution rather than by a map.
Detrunking complicates it. Roads transfer between National Highways and local authorities, and the designation on an old plan may be out of date, so confirm the current position rather than assuming.
The ways National Highways can respond
Four responses are available, and the difference between them matters to the programme.
| Response | Effect on the application |
|---|---|
| No objection | The council determines as normal |
| No objection subject to conditions or obligations | Conditions or a section 106 are needed in the form asked for |
| Recommendation of refusal | The council can still approve, but does so against advice |
| Direction restricting the grant | The council cannot issue a permission while the direction stands |
A holding direction is the one that stops the clock. It is issued on behalf of the Secretary of State and prevents the council granting permission for a stated period, usually while further information is provided or modelling is agreed. Directions are routinely extended, and a scheme can sit under one for months.
Being placed under a direction is not a refusal and it is not fatal. It is a signal that the evidence is not yet good enough to let the decision proceed, and the route out is technical rather than political.
The grounds that generate objections
Safety comes first and is the hardest to argue with. Any proposal creating a new direct access onto the network, intensifying an existing one, or adding turning movements at a junction with a collision record will meet resistance, and the policy position in the sustainable development circular for the strategic road network is that new accesses should be avoided.
Capacity is the second ground. Where a junction is already operating close to or beyond its practical capacity, additional trips push the ratio of flow to capacity and queue lengths past what the operator will accept, and the objection is that the residual cumulative impact on the network is severe.
Evidence quality is the third, and it causes more delay than the other two combined. Objections on this ground read as a list: the trip rates are not agreed, the distribution is unsupported, committed development has been omitted, the assessment year is wrong, the growth factors do not match the published traffic forecasts, the model has not been validated.
The fourth is design. Access geometry, visibility, merge and diverge lengths and signing all have to meet the design standards for the network rather than local standards, and a layout drawn to a county design guide will be rejected on that basis alone.
The evidence that clears an objection
Agree the scope before you model. A written scoping note covering the study area, the junctions to be assessed, trip generation parameters, distribution method, assessment years, growth assumptions and the list of committed developments removes most of the argument, and National Highways will comment on it if asked.
After that, the pieces are predictable:
- Trip generation from the recognised trip rate database, with the site selection criteria stated and the surveys used disclosed.
- Distribution supported by census travel to work data, mobile network data or a local model, not by assertion.
- Junction modelling with the software and version named, the calibration or validation reported, and the outputs shown for the agreed years.
- Five years of personal injury collision data for the junctions and links affected, analysed for pattern rather than tabulated.
- An access design drawn to the network design standards, with a road safety audit by an independent team.
- Sustainable travel measures that are deliverable and secured, with monitoring.
A Transport Assessment is the document that carries all of this, and the thresholds that determine whether you need one at all are covered in our note on trip thresholds that trigger a Transport Assessment. The policy expectations that National Highways applies are set out in the circular, which we look at in more detail in Circular 01/2022 and access onto the strategic road network.
Road safety audits and detailed highway design are engineering work for a qualified team, and a planning stage draft is a starting point for them rather than a substitute.
Mitigation and the section 278 programme
Where impact is accepted and mitigation is needed, works on the network are delivered under an agreement with the highway authority made under section 278 of the Highways Act 1980. That agreement carries its own technical approval process, its own fees and its own timetable, and it is the item most often underestimated.
Plan for design development, technical approval, a safety audit at each stage, land acquisition where the works go beyond the highway boundary, and a bond or surety. Twelve months from planning permission to a signed agreement is not unusual on a junction improvement, and construction has to be programmed around network occupancy restrictions.
Phasing is the tool that makes large schemes work. A trigger based condition that limits occupation until a junction improvement is complete gives National Highways certainty without holding up the first phase, and the consultation response from National Highways will often propose exactly that.
Contributions towards a wider improvement already programmed are cleaner than bespoke works, where such a scheme exists and the tests for planning obligations are met. Ask whether one is in the delivery plan before designing your own.
When it cannot be resolved
Some objections are structural. A junction with no capacity headroom and no funded improvement, or an access that cannot be made safe, will not be argued away with better modelling.
Three options remain. Reduce the quantum so the impact falls below the threshold that concerns the operator. Redesign the access to take trips somewhere else. Or phase the scheme so the constrained element is delivered later, with a Grampian condition tying it to the improvement.
If the council refuses on highways grounds, National Highways will normally appear at any inquiry, and the appeal turns into a technical contest between transport witnesses. That is an expensive way to have the conversation you could have had at scoping stage.
Book the pre-application meeting with National Highways at the same time as the one with the council, and take a draft scoping note to it. A Travel Plan with monitoring and a named coordinator, prepared early rather than bolted on, also removes one of the standard conditions from the negotiation. PlanScope drafts transport supporting documents in minutes, structured to UK planning policy and flagging the survey data it does not hold. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.
Frequently asked questions
What is a holding direction?
A direction issued on behalf of the Secretary of State that prevents the local planning authority granting permission for a stated period, usually while further transport evidence is provided or modelling is agreed. It is not a refusal, it is routinely extended, and the way out is technical: agree the scope, supply the analysis and resolve the point raised.
When is the strategic road network engaged?
When traffic generated by the site routes through a motorway or trunk road junction in enough volume to matter, which is a question of trip distribution rather than distance. A site two miles away can engage it and a site adjoining a trunk road may not. Confirm the current designation, because roads are detrunked and old plans go out of date.
Can a council approve against a National Highways objection?
Where the response is a recommendation of refusal, yes, though it does so against the advice of the network operator and the decision is exposed on appeal or challenge. Where a direction restricting the grant has been issued, no: the council cannot issue a permission while the direction stands.
How long does a section 278 agreement take?
Longer than most programmes assume. Design development, technical approval, safety audit at each stage, any land acquisition outside the highway boundary, the bond and the legal agreement itself commonly add up to around a year on a junction improvement, before construction is programmed around network occupancy restrictions.
What usually causes an objection on evidence grounds?
Trip rates that were not agreed, distribution supported by assertion rather than data, committed development left out of the baseline, the wrong assessment year, growth factors that do not match published forecasts, and junction models with no reported validation. A written scoping note agreed before modelling removes most of these before they arise.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.