Choosing a transport planner for a highway case

The highway officer consulted on your application reads a small number of things carefully, and skims the rest. The trip generation and where the rates came from. The visibility splays and the speed evidence behind them. Five years of personal injury collision data for the local network. The access drawing with a swept path on it. And whether the parking provision matches the authority's adopted standards.

So the question when appointing is narrow. Can this person defend those five items to the officer who will challenge them? Not whether the firm has a nice brochure.

Match the appointment to the document

Get the document type settled first, because it determines the skills you are buying.

A Transport Statement suits a scheme with modest transport implications. It describes the site, the access, the trip generation, parking and sustainable travel options, without capacity modelling. A Transport Assessment goes further, with junction capacity modelling, a distribution and assignment of trips, an accident analysis and a mitigation case. A Travel Plan is a management document with targets, measures, a coordinator and monitoring.

Planning Practice Guidance expects proportionality, and the highway authority's own thresholds sit inside that. Ask them in writing which document they expect for your scheme and record the answer. A self-builder who commissions a full Assessment for two dwellings has spent several thousand pounds to answer a question nobody asked, and one who submits a two-page note for a scheme needing modelling will be back at the start eight weeks later.

The Transport Statement page sets out what that document covers and where the boundary with a full Assessment sits.

Membership, and what it tells you

Three credentials carry weight with highway authorities. Chartered or full membership of the Chartered Institution of Highways and Transportation. Membership of the Chartered Institute of Logistics and Transport. And the Transport Planning Professional qualification, which is specific to this discipline rather than to engineering generally.

What membership gives you is a tested standard, continuing professional development and a code of conduct with a complaints route. What it does not give you is subject match. A chartered highways engineer may be excellent at geometric design and unfamiliar with trip rate selection. A transport planner may model a signal junction well and never have produced a section 278 concept design.

The same gap between a credential and a competence applies across the professions, and it sits alongside what chartered membership of the RTPI actually means.

Ask two direct questions. Who personally will write the document, and what is their membership. And name three schemes they have taken through this highway authority in the last two years.

Modelling competence against reporting competence

These are different jobs and small consultancies sometimes conflate them.

Modelling competence means being able to build and calibrate a junction capacity model, justify the flows that go into it, run the design years the authority asks for, and explain a degree of saturation figure without hiding behind the output. It also means knowing when a model is the wrong tool, which on a minor access is most of the time.

Reporting competence means selecting comparable sites from a trip rate database and defending the selection criteria, reading collision data critically rather than concluding that no pattern exists, describing the access geometry against the right standard, and writing something an officer and a committee can both follow.

On a small scheme the second skill matters far more than the first. Most objections to a minor access are about visibility, refuse, pedestrian safety and parking stress, none of which needs a model. What they need is someone who will go and stand at the junction.

Local knowledge earns its fee

This is where the real variation in quality sits, and it is hard to test from a proposal.

Useful local knowledge means knowing the authority's parking standards document and whether the figures are minimums, maximums or zone-based. Knowing which accessibility standard it applies to walking distances. Knowing whether it accepts Manual for Streets geometry on estate roads or insists on a design guide of its own. Knowing how its officers want speed surveys done. And knowing the two or three points that authority raises on every application regardless of merit.

Ask a candidate what this authority always asks for. Someone who works there regularly will answer in one sentence. Someone who does not will describe their general approach.

Scoping the appointment so you do not pay twice

Rework is the main cost risk, and it comes from an undefined scope.

1. Write to the highway authority with a site plan and a short scheme description, and ask what transport document and what supporting surveys it expects.
2. Turn the reply into a scope: document type, drawings, surveys, modelling if any, and the number of design years.
3. Ask the consultant to confirm, in the proposal, which of those items are included and which are excluded.
4. Fix the survey timing early. Traffic counts belong in neutral months, avoiding August and December, and parking surveys under the standard overnight methodology avoid school holidays.
5. Agree who responds to consultee comments and how many rounds are covered.
6. Agree who attends a committee or produces appeal evidence, and at what rate.

The brief is the document that makes all of this enforceable, and the clauses worth including are set out in writing a brief for a specialist planning report.

Checking the draft before it goes in

Read the draft yourself, even without the technical background. Six checks catch most problems.

Are the trip rates sourced, with the site selection criteria stated, and do the comparison sites resemble your development in land use, size and location type? Does the survey data fall in a neutral period? Does the visibility splay in the drawing match the speed evidence in the text? Is the collision data for a stated period from the authority's own records, with each collision considered rather than dismissed in aggregate? Do the parking figures cite the adopted standard by name and date? And does the access drawing show a swept path for the largest vehicle that will actually use it, including a refuse vehicle?

Then check the internal consistency. A document that claims the site is within walking distance of a bus stop, and elsewhere proposes a car parking ratio suited to a rural site, will be read as boilerplate. If you are picking up work someone else commissioned, reviewing a specialist report you did not commission covers the order to do it in.

Fees and variations

Expect a fixed fee against a defined scope, with named exclusions and a stated rate for additional work. The items that generate disputes are predictable: topographical survey, speed survey, parking survey, trip rate database access, junction modelling, additional design years, section 278 concept design, responses beyond the first round of consultation, and committee or appeal attendance.

Two habits protect you. Put the highway authority's reply about expected documents into the appointment as an appendix, so the scope has an external anchor. And ask for the fee to be split between the planning application document and any later highway agreement design, because the second is engineering work with a different cost base and you may not need the same firm for it.

Where you need a professional to review a drafted transport document before submission, the professional directory is the route to a reviewer. Councils usually expect a suitably qualified author for transport work, and professional review of any draft is strongly advised.

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.