Reviewing a drafted transport statement before submission
A transport statement lives or dies on a handful of assumptions. Here is the order to check them in, and the point at which a transport planner has to take the work on.
Reviewing a transport statement is a matter of checking a small number of assumptions that a highway officer will test first. Get those right and the document is usually accepted without a holding objection. Get them wrong and the officer's response asks for the work to be redone, which costs more time than the review would have taken. The checks below apply whether the draft came from a consultant, a junior colleague or an AI-assisted first draft that needs a practitioner to take it on.
Work through them in order. The first one catches more errors than the rest combined.
The description of development has to match everything else
Open the draft alongside the application form and the drawing schedule. The description of development, the unit numbers, the floorspace figures and the use classes should be identical in all three. They frequently are not, because the transport work was commissioned from an early scheme and never updated.
Check the floorspace basis as well as the number. Gross external area and gross internal area produce different trip rates, and a document that quotes one while the drawings state the other will be queried. The same applies to unit mix, because a scheme described as 40 flats and modelled as 40 dwellings generates a different forecast from one modelled by bedroom count.
Consistency between written documents and drawings is the most common cause of validation queries generally, not only on transport work. Raise any mismatch with the design team before the transport planner spends time on a superseded scheme, and use a pre-application meeting to fix the description if it is still moving, as covered in using a draft to prepare for a pre-application meeting.
Trip generation and where the numbers came from
Trip rates in a Transport Statement normally come from the TRICS database, and the credibility of the whole document rests on how the site selection was done.
The draft should state, in the body rather than an appendix:
- The land use category and subcategory selected.
- The geographic filter applied, and whether Greater London sites were included or excluded.
- The date range of the surveys used, and the number of sites in the final set.
- The parameter range, so the selected sites are comparable in scale to the proposal.
- The survey periods reported, usually the weekday morning and evening peak hours plus a daily total.
A draft that says trip rates were derived from TRICS without stating the filters is not reviewable. Ask for the site list. If the set includes three sites, two of which are out of town retail parks and one a village shop, the rates will not survive scrutiny.
Watch for the multi-modal question. Where a scheme relies on a low car mode share, the statement needs to say where that share came from, and census travel to work data for the relevant output area is the usual starting point rather than an assumption.
Parking standards and the accessibility case
Parking provision is tested against the adopted local standard, which is usually in the local plan or a parking standards supplementary planning document. The draft should cite the policy by name and number and set out the standard as maximum or minimum, because the two are argued in opposite directions.
In London the standard varies with public transport accessibility level, and the draft should state the level, the source and the date it was checked. Outside London, accessibility is argued qualitatively using distances to bus stops, rail stations and services, and those distances should be measured along walking routes rather than in straight lines.
Cycle parking is where drafts are weakest. Check the number, the type, whether long stay spaces are covered and secure, and whether the location shown on the drawings is actually usable. A cycle store reached through a communal hallway and down three steps does not comply with anything.
Electric vehicle charging provision now appears in both planning policy and building regulations, and the two requirements are not identical. State which is being relied on.
Access geometry and visibility
Visibility splays are the second most common failure point after trip rates. The draft should state the x distance at the access, normally taken back from the give way line, and the y distance along the carriageway, together with the design speed used and its source.
Design speed should come from measured vehicle speeds where the road is not obviously constrained, not from the posted speed limit. An officer who has driven the road will notice if a 30mph limit is used on a road where traffic runs at 38mph. Where speed survey data exists, the draft should say when it was collected and by whom.
Check the splays against the drawings rather than accepting the text. The splay must fall within land the applicant controls or within the adopted highway, and it must be clear of walls, hedges, parked cars and street furniture. A splay drawn across a neighbour's front garden is not deliverable, and a condition requiring it to be kept clear will not save it.
Manual for Streets and the Design Manual for Roads and Bridges take different approaches and apply to different road types. Using the wrong one is a substantive error, not a presentational one.
Walking, cycling and servicing
The statement should describe the pedestrian and cycle routes from the site to the nearest services, with a plan, and identify where those routes are substandard. An honest account of a missing dropped kerb or a gap in a footway carries more weight than a claim that the site is highly accessible.
Cycle infrastructure design guidance sets out the standards a highway authority will expect for any new provision, and a scheme proposing a shared surface or a substandard width should say so and justify it.
Servicing and refuse collection are routinely skipped in drafts. Check the swept path analysis for the largest expected vehicle, the bin presentation point and the drag distance from store to collection point. Where the authority's standard drag distance is exceeded, the statement should address it directly rather than leaving the officer to measure.
Construction traffic
A transport statement is not the place for a full construction management strategy, but it should identify the construction access, the expected routing and any constraint that would make construction traffic difficult. Where the scheme is large enough, a separate Construction Traffic Management Plan is normally secured by condition, and the statement should say so rather than leaving a gap.
If the site is on or close to the strategic road network, National Highways becomes a consultee and its expectations differ from the local highway authority's. Identify that early.
Where a transport planner has to take over
There is a line past which review is not enough. A Transport Statement covers modest development where the highway effects can be described. Once the scheme is large enough to need junction capacity modelling, a Transport Assessment is required instead, and that document needs an author with the competence and data access to produce it.
Junction modelling, signal optimisation, accident data analysis and travel plan measures secured by obligation all sit with a transport planner. Councils usually expect a suitably qualified author for transport work, and professional review is strongly advised even where the scheme sits below the assessment threshold.
The practical division is this. A practitioner can review structure, consistency, policy citation and whether the stated assumptions are stated at all. A transport planner is needed to say whether the assumptions are right.
Errors of fact are the ones that do the most damage in the review stage, and the factual errors to look for in a drafted planning document covers the wider pattern. Build the checks into a standing list rather than repeating them from memory, along the lines of an internal review checklist for submissions.
And send the draft to the transport planner with your review comments attached, rather than asking them to start again. It is a faster and cheaper instruction.
This is general guidance, not legal advice. Check the position with your local highway authority, 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.
Frequently asked questions
What should a transport statement say about TRICS?
It should state the land use category and subcategory, the geographic filter applied, the survey date range, the number of sites in the final set, the parameter range and the survey periods reported. A statement that says rates were derived from TRICS without those filters cannot be reviewed or defended.
How is design speed chosen for visibility splays?
From measured vehicle speeds where the road is not obviously constrained, rather than from the posted limit. The draft should state when speed data was collected and by whom. Using a 30mph limit on a road where traffic runs faster is the error a highway officer who knows the road will spot first.
When is a Transport Assessment needed rather than a statement?
Once the scheme is large enough that highway effects need junction capacity modelling rather than description. National guidance sets indicative thresholds and local authorities publish their own, so agree the scope with the highway authority at pre-application stage rather than assuming the lighter document will be accepted.
Can an AI-assisted draft be submitted as a transport statement?
It should be treated as a first draft for a transport planner to take on. A draft can carry structure, site facts and policy citations and can be checked for consistency, but confirming whether trip rates, splays and capacity assumptions are correct requires professional judgement and access to the underlying data.
What is usually missing from transport drafts?
Servicing and refuse collection. Check the swept path analysis for the largest expected vehicle, the bin presentation point and the drag distance from store to collection point. Cycle parking is the other weak area, particularly whether long stay spaces are covered, secure and reachable without steps.
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.