Overcoming Highways Objections to Planning Applications
Facing a highways objection to a planning application? Learn how highway safety, congestion, technical standards and mitigation are assessed and how objections can be challenged.
PLANNING APPLICATIONS
Andrew Ransome
8/17/20269 min read
Highways and transport objections from statutory consultees can often be some of the most challenging issues to resolve during the planning process.
They are also one of the few areas where the National Planning Policy Framework (NPPF) sets a particularly clear threshold for refusal.
Paragraph 116 states that development should only be prevented or refused on highways grounds where there would be an unacceptable impact on highway safety, or where the residual cumulative impacts on the road network, following mitigation, would be severe, taking into account all reasonable future scenarios.
That is a high bar. But it does not mean that every highways objection is fatal to a planning application.
In my experience, highways objections are often more negotiable and more challengeable than they initially appear. The key is understanding exactly what the highway authority is objecting to, what technical standard or evidence sits behind that objection, and whether the evidence actually demonstrates the level of harm required to justify refusal.
Why Highways Objections Can Be Difficult to Overcome
Paragraph 116 of the NPPF is short, but it carries considerable weight.
It establishes two principal circumstances in which a development may properly be refused on highways grounds:
where there would be an unacceptable impact on highway safety, or
where the residual cumulative impacts on the road network, following mitigation, would be severe.
This is important because the existence of a highways impact is not, in itself, sufficient to justify refusal.
Almost every development will have some effect on the transport network. A new house generates vehicle movements. A larger development generates more. There may be additional pressure at a junction, more vehicles using a particular road or greater demand for parking.
The planning question is whether those effects amount to the level of harm identified by national policy.
This is also why it is important to distinguish between a genuine highway safety concern and a more general concern about inconvenience, congestion or change.
A development may increase traffic on a road without creating an unacceptable highway safety impact.
Similarly, residents may be concerned that parking will become more difficult or that a road will feel busier.
Those concerns may be relevant to the planning assessment, but they do not automatically establish that the NPPF threshold for refusal has been met.
The same applies to congestion and capacity.
Paragraph 116 refers specifically to the residual cumulative impacts on the road network being severe, following mitigation. Paragraph 115 also requires significant impacts on the transport network, including capacity and congestion, or highway safety, to be capable of being mitigated to an acceptable degree through a vision-led approach.
If the issue is highway safety, you may need robust technical evidence addressing matters such as visibility splays, vehicle speeds, junction geometry, pedestrian movements or collision history.
If the issue is network capacity, the assessment may instead need to consider traffic generation, distribution, junction operation, cumulative development and the effectiveness of proposed mitigation.
The first step is to establish which problem you are actually trying to solve.
Why highways decisions are not simply a matter of applying a formula
It is sometimes assumed that highways decisions are purely technical and that if the highway authority objects, planning permission cannot realistically be granted.
That is not how the planning system works.
Whether a proposal would result in an unacceptable impact on highway safety, or whether residual cumulative impacts would be severe, is ultimately a matter for the decision-maker.
The highway authority's advice is clearly important, particularly where it is supported by technical evidence, but it is not the decision itself.
The evidence may include traffic flows and speeds, visibility assessments, junction capacity calculations, collision data, swept-path analysis, parking surveys, transport assessments and site observations.
Representations from local residents may also identify genuine concerns that need to be considered.
However, each piece of evidence needs to be considered in context.
For example, the absence of recorded personal injury collisions does not necessarily prove that an access is safe. Equally, a history of collisions does not automatically mean that a proposed development would create an unacceptable safety impact.
The relevance, location, circumstances and frequency of those collisions all need to be considered.
This is why highways disputes can sometimes become matters of professional judgement rather than simply a question of whether a particular numerical standard has been met.
A highway authority's objection should therefore be treated seriously, but it should not necessarily be treated as the end of the road.
Where an applicant has robust technical evidence, a well-designed proposal and appropriate mitigation, there may be a strong basis for further discussion with the highway authority or, where necessary, for defending the proposal at appeal.
Getting the right technical standard applied to your site
One of the most important parts of dealing with a highways objection is establishing which technical standards actually apply.
This is an area where mistakes can have significant consequences.
The appropriate design requirements for a lightly trafficked residential street may be very different from those applicable to a busy road or the strategic road network.
Standards relating to visibility, junction geometry, access arrangements and road design need to be considered in the context of the function, speed and characteristics of the road in question.
A common source of dispute is therefore the application of a technical standard that is not appropriate to the character, function or speed environment of the road.
This does not mean that standards should simply be ignored when they create difficulties for a proposal. Rather, the important question is whether the standard being relied upon is the correct one, whether it has been applied correctly, and whether there are circumstances on the particular site that need to be taken into account.
This can be particularly important on existing roads, where the development is being introduced into an established environment rather than creating an entirely new highway.
If a highways objection relies upon a particular standard, it is worth asking three simple questions:
What is the standard?
Why does it apply to this road and this proposal?
Does the evidence demonstrate that failing to meet it would actually result in an unacceptable highway safety impact?
Those questions can sometimes expose a highways objection that initially appears more significant than it really is.
Mitigation is often the key
Another important point is that the NPPF does not require an applicant to demonstrate that a development will have no transport impact.
Instead, the Framework recognises that significant impacts on the transport network or highway safety can be mitigated to an acceptable degree. Paragraph 116 then considers the residual cumulative impact following mitigation.
This makes mitigation an important part of the discussion.
Depending on the circumstances, mitigation could involve changes to the site access, improvements to visibility, alterations to the internal layout, pedestrian infrastructure, parking arrangements, traffic management measures or contributions towards appropriate off-site highway works.
The appropriate mitigation will obviously depend upon the nature and scale of the development.
The important point is that the assessment should not simply identify an impact and stop there. The question should be what reasonable measures can be put in place to address that impact and what harm, if any, remains afterwards.
Government guidance on transport assessments similarly identifies matters such as road capacity, trip generation, safety implications, sustainable travel measures and mitigation as relevant considerations.
It also highlights the need to consider cumulative impacts from other committed development where appropriate.
What it costs you if you get it wrong
Highways objections are not simply a planning issue. They can have significant commercial consequences.
They tend to be raised early in the application process and can influence the entire trajectory of an application.
A holding objection may result in additional surveys and technical work being commissioned.
A refusal on highways grounds can then lead to an appeal, further professional costs and potentially many months of delay.
For a landowner promoting a site through the local plan process, an unresolved highways issue can be even more significant. A site may otherwise perform well against the relevant planning criteria, but concerns about access, highway capacity or safety can affect whether the site is considered suitable for allocation.
This is why it is usually better to identify potential highways issues before submitting an application rather than waiting for an objection to appear.
A transport statement or assessment commissioned at the appropriate stage, and properly scoped around the issues likely to determine the application, can be considerably more useful than a generic assessment produced reactively after a refusal reason has been issued.
The objective should be to understand the likely highways constraints early enough to influence the design of the proposal.
Reading between the lines of a highways objection
When a highway authority response arrives, it is worth breaking it down rather than simply reacting to the word "objection".
Not every comment from a highway authority amounts to a reason why planning permission should be refused.
For example, there is an important difference between:
a request for additional information;
a holding objection pending further evidence;
a request for amendments or mitigation;
a technical concern that can potentially be resolved; and
a substantive objection that the development would create an unacceptable safety impact or severe residual cumulative impacts.
The precise wording matters.
It is also worth asking what evidence supports the objection.
Is there a speed survey?
Is the visibility assessment based on measured conditions?
Has the existing highway geometry been accurately recorded?
Is the collision evidence relevant to the location and type of access being proposed?
Has the traffic generation been calculated using an appropriate methodology?
Have committed developments been properly considered?
Is the objection based upon the actual characteristics of the site, or is it relying on a generalised concern about development in the area?
These questions do not mean that technical objections should be dismissed. They are about understanding exactly what is being alleged and whether the evidence supports the conclusion being reached.
How to respond to a highways objection
A good response should generally avoid simply arguing that the highway authority is wrong.
Instead, the objection should be worked through systematically.
First, identify the precise concern.
Second, identify the policy or technical standard being relied upon.
Third, establish whether that standard is applicable to the site and proposal.
Fourth, test the assumptions and evidence underpinning the objection.
Fifth, consider whether the proposal can be amended or whether appropriate mitigation can be provided.
Finally, assess what residual impact remains once that mitigation has been taken into account.
This approach can often turn a broad highways objection into a series of much more manageable technical questions.
It also creates a much stronger evidential basis for discussions with the highway authority and, if necessary, for an appeal.
For larger or more complex schemes, the transport assessment should be proportionate to the scale and significance of the transport issues involved.
The NPPF requires developments generating significant amounts of movement to be supported by a vision-led transport statement or transport assessment so that their likely impacts can be assessed and monitored.
The objective is not to produce technical evidence for its own sake. It is to answer the particular question that the decision-maker needs to resolve.
When a highways objection remains unresolved
Sometimes, despite further evidence, amendments and mitigation, the highway authority remains opposed to a proposal.
At that point, it is important to step back and consider the planning case as a whole.
The question is not necessarily whether the highway authority is satisfied. The question for the decision-maker is whether the evidence demonstrates that the relevant NPPF threshold for refusal has been reached.
That distinction can be particularly important at appeal.
An Inspector will consider the evidence independently and will need to reach a reasoned conclusion on whether the proposal would result in an unacceptable impact on highway safety or severe residual cumulative impacts on the road network.
That does not mean a highway authority's technical evidence can simply be disregarded. A well-supported objection can carry considerable weight. But where there is competing technical evidence, a disagreement between professionals, or a question about the correct application of standards, the issue may ultimately come down to which evidence is more persuasive.
This is one reason why a highways objection should be analysed rather than simply accepted.
The underlying principle
Across almost every highways dispute I come across, the same pattern holds: highways objections are often more negotiable and more challengeable than they initially appear.
That does not mean that genuine highway safety concerns should be minimised. Nor does it mean that every highways objection can be overcome with additional planning arguments.
It means that the objection needs to be understood properly.
The NPPF sets a clear threshold.
Development should only be prevented or refused on highways grounds where there would be an unacceptable impact on highway safety, or where the residual cumulative impacts on the road network, following mitigation, would be severe, taking account of reasonable future scenarios.
For a landowner considering promoting a site, or a developer facing a highways objection on a live application, the objective should therefore be to establish as early as possible what the real issue is.
Is it a genuine safety concern?
Is it a question of visibility or access design?
Is the concern about junction capacity or congestion?
Is there a technical standard being applied that may not be appropriate to the site?
Can the issue be addressed through mitigation?
Or is the objection ultimately based upon a general concern about additional traffic rather than evidence of the level of harm required by national policy?
Getting that distinction right can shape everything that follows — the design of the scheme, the evidence you commission, the discussions you have with the highway authority and, ultimately, your ability to defend the proposal if an appeal becomes necessary.
As with all planning matters, every site is different. Highways issues should be assessed on their own circumstances and with appropriate site-specific technical advice.
Andrew Ransome MRTPI - Email: andrew@andrewransome.co.uk
About me
Andrew Ransome is a Planning Director and a Chartered Member of the Royal Town Planning Institute (RTPI), with more than two decades of experience in town planning.
He specialises in delivering strategic planning solutions for complex developments across both rural and urban environments, helping clients navigate planning challenges and unlock development opportunities. Connect with Andrew on Linkedin.
Planning Application Information
Get in touch for planning advice: Email: andrew@andrewransome.co.uk
© 2026. All rights reserved.
The content on this website is provided for general information purposes only and does not constitute planning or legal advice. Planning policy, legislation, and case law change over time, and every planning matter should be assessed on its own merits. No responsibility is accepted for any loss or action taken in reliance on the content of this site. The projects, planning applications and appeals presented on this website reflect professional work undertaken by, or involving me, throughout my career, including work undertaken in both my current and previous employment positions.