Transport assessments have followed a familiar logic for years. Forecast the traffic a development will generate, test it against the network, and show that any impact can be managed. The revised National Planning Policy Framework changes the starting point for that work, and the shift matters for anyone bringing a scheme forward.

The consultation on the revised National Planning Policy Framework closed on 10 March 2026, and the final version is expected during summer 2026. The direction is already clear from the draft. Transport is being pushed towards a vision-led approach and away from the capacity-first thinking that has shaped assessments for a long time.

From predict and provide to vision-led

For decades, transport work has leaned on predict and provide. You predict future demand, then provide the capacity to meet it. The revised framework sets out a different basis. It asks for outcomes to be defined first, well-designed and sustainable places that people actually want to live in, then for transport solutions that deliver those outcomes.

That reordering sounds subtle. In practice it changes what a transport assessment is trying to prove. The question moves from whether the network can absorb the traffic to what kind of place is being created and how people move around it. Vehicle capacity still counts, but it stops being the only test. TPA has written before about the move away from predicting demand towards a decide and provide mindset, and the revised framework brings that thinking into national policy.

The severe test still stands

One thing has not changed. Refusal on highways grounds still turns on whether the residual cumulative impact would be severe, or whether there is an unacceptable impact on highway safety. The wording has been adjusted so that this is judged against a range of reasonable future scenarios agreed with the local planning authority, rather than a single forecast.

For developers, that means the scenarios you test, and how you agree them, carry more weight than before. A single optimistic forecast is easy to challenge. A tested range, agreed early with the authority, is much harder to unpick later. The burden shifts towards showing your working and towards agreement, not towards a single headline number.

The guidance is the missing piece

The framework sets the direction, but the detailed transport assessment guidance that tells everyone how to apply it in practice has not caught up. Industry bodies have been clear that new guidance is needed if vision-led work is to be applied the same way across the country. Until it lands, there will be a period where authorities read the same policy differently. That gap is worth planning around rather than waiting out. Agreeing the approach with the authority at the pre-application stage is the most reliable way to settle it before it becomes contested.

What it means for your modelling

The modelling pipeline does not disappear under a vision-led regime. Trip generation, distribution and assignment still sit underneath the work. What changes is how the outputs are framed and what they are asked to support. This is covered in more detail in TPA’s piece on how transport modelling shapes development decisions.

Distribution in particular becomes more exposed. If the scenarios are agreed with the authority, the assumptions behind them need to be defensible from the outset. Weak distribution has always been a soft target in review. Under an approach that leans on agreed scenarios, it is more so. Two schemes that generate the same number of trips can land very differently depending on where those trips go, and that judgement now sits closer to the heart of the case.

A worked example

Take a residential scheme on the edge of a market town. Under the old logic, the assessment would forecast peak-hour vehicle trips, load them onto the nearest junction, and argue the delay stays inside acceptable limits. Under a vision-led approach, the same scheme starts from the outcome. What does good access look like here, how far can walking, cycling and public transport carry the daily trips, and what layout supports that. The vehicle assessment still happens, but it follows the place-making, rather than driving it. That sequence tends to produce a stronger and more defensible case, because the sustainable measures are built in rather than bolted on to answer an objection.

Practical steps before submission

A few things help a transport assessment hold up under the revised framework:

  • Agree the scope and the scenarios with the authority early, in writing where you can.
  • Frame the assessment around the outcomes for the place, not vehicle capacity alone.
  • Keep distribution grounded in real data and local knowledge, and be ready to explain it.
  • Treat sustainable access as part of the core case, not a final add-on.

None of this is new to good practice. The framework makes it harder to get away with the shortcuts.

A moving picture

Because the final framework is still to be published, some of the detail may shift. The core direction, vision-led over predict and provide, looks settled. The exact wording, and the guidance that follows, will shape how it plays out on real schemes. Getting transport input in early is the safest way to stay ahead of it.

If you want a view on how the revised framework affects a scheme you are working on, TPA’s team can help. You can get in touch with TPA’s team via the London office, the Bristol office, or the Cambridge office to talk it through.