Transport for London consultation and the TLRN
Transport for London is consulted as highway authority for red routes, as adviser on referable schemes and as asset protector near its infrastructure. Here is how each works.
In London, two consultation routes run alongside the borough's own process, and Transport for London sits in both. It is consulted where a development affects the road network it manages, and it advises the Mayor on applications referable under the Mayor of London Order. Getting either wrong adds weeks, and on a scheme close to a red route it can add a design change.
This article covers London only. Outside London the highway authority arrangements are different.
Which applications reach Transport for London
Three triggers matter.
The first is location. Where a proposal affects the Transport for London Road Network, the borough consults Transport for London as highway authority for those roads. That covers access, servicing, visibility, crossovers and anything physically touching the carriageway or footway.
The second is scale. Applications that meet the categories in the Town and Country Planning (Mayor of London) Order 2008 are referable to the Mayor as development of potential strategic importance, and Transport for London provides transport advice in the Greater London Authority's stage one response. Referral categories are set by number of dwellings, floorspace, height and location, so check the Order and the current thresholds rather than working from memory.
The third is asset protection. Where a site sits over or beside London Underground, Docklands Light Railway or a safeguarded route, Transport for London's asset protection team engages regardless of scale, and that engagement is technical rather than policy-based.
A borough will normally consult on all three at the same time. The responses come back separately and can pull in different directions, which is why a pre-application meeting with the borough and Transport for London together is worth the fee on anything substantial.
The road network it controls and what that changes
The Transport for London Road Network is the set of London's most heavily used roads, managed directly by Transport for London rather than by the boroughs. They are the red routes, marked by red lines instead of yellow ones, with different rules on stopping.
Three consequences follow for an applicant.
Any works to the carriageway or footway on a red route are agreed with Transport for London, not the borough, and highway works agreements under section 278 of the Highways Act 1980 are made with them. Their process, standards and timescales are their own.
Stopping is more restricted than on a borough road. Red lines mean no stopping at all during the controlled hours, including for loading, unless there is a marked bay. That has a direct effect on how a commercial unit is serviced and on whether a residential scheme can have a drop-off.
And new vehicular accesses onto a red route are resisted strongly. Where an existing access is being intensified, expect to be asked to justify it against alternatives on the side street.
Boroughs also manage strategic roads of their own, and some London boroughs have local networks with similar restrictions. Check who manages the specific length of road outside the site before assuming.
Healthy Streets and the assessment expected
The London Plan builds its transport policies around the Healthy Streets Approach, with Policy T2 setting the framework and Policy T4 dealing with assessing and mitigating transport impacts. Development proposals are expected to show how they contribute to the ten Healthy Streets Indicators, which cover things like pedestrian comfort, shade and shelter, clean air, places to stop and rest, and whether people feel safe.
For a scheme of any size, that means a transport assessment that is structured around those indicators rather than around vehicle capacity alone. Transport for London publishes guidance on the assessment tools it expects, including pedestrian comfort level analysis and healthy streets scoring, and boroughs increasingly ask for the outputs directly.
Practically, three pieces of evidence carry weight. Pedestrian comfort levels on the footways the scheme will load. A demonstration that the access and servicing arrangement does not degrade the walking and cycling environment. And a permeability analysis showing how the site connects to what is around it.
A Transport Assessment is the right document above the scale thresholds, and a Transport Statement below them. Councils expect a suitably qualified transport planner as author, and professional review is strongly advised.
Cycle parking and car-free expectations
London Plan policies set minimum cycle parking standards by land use, and boroughs apply them through their own plans. Two details cause most of the amendments.
Long stay cycle parking has to be usable in practice: at ground level or with lift access, secure, covered, with two-tier racks properly spaced and space for non-standard cycles including adapted cycles and cargo bikes. A store reached by a flight of stairs is refused routinely.
Short stay cycle parking has to be near the entrance and visible, not tucked behind a bin store.
On car parking, the London Plan pushes towards car-free development in areas with good public transport access, measured by the public transport accessibility level of the site. Where a scheme is car-free, that has to be secured, usually by a section 106 obligation excluding future occupiers from applying for residents' parking permits. An unsecured statement of intent is not enough, and a borough with no controlled parking zone in place may ask for a commitment to fund one.
Where parking is retained, blue badge provision and electric vehicle charging still apply, and an unrealistic assumption about future demand is easier to challenge than an evidenced one. A Parking Survey provides the on-street stress evidence where the borough disputes the position.
Crossrail and other infrastructure safeguarding
Safeguarding directions protect land needed for future transport infrastructure. Where a site is inside a safeguarded area, the borough must consult the relevant body and cannot grant permission that would prejudice the scheme without going through that process.
The practical effect on a development is usually about foundations, ground movement and construction methodology rather than about land use. Expect requests for a ground movement assessment, a settlement analysis and a construction methodology statement, and expect conditions requiring approval of those before work starts.
Start this early. The technical review is done by engineers on a programme that has nothing to do with the eight or thirteen week determination period, and it is a common cause of an extension of time agreement.
Timing the consultation into the programme
An illustrative sequence for a mid-sized scheme near a red route.
- Pre-application meeting with the borough, with Transport for London invited, before the layout is fixed.
- Asset protection enquiry submitted in parallel if any underground infrastructure is nearby.
- Transport assessment scoped in writing with the borough and Transport for London, so the trip generation method, survey dates and Healthy Streets tools are agreed rather than argued.
- Surveys carried out in neutral months, avoiding August, December and school holidays.
- Application submitted, with the section 278 conversation opened separately rather than waiting for permission.
- Stage one referral to the Mayor where the scheme is referable, allowing time in the programme for the response and any resulting amendments.
Step three is the one that saves the most time. A scoping note agreed in advance removes the single most common reason for a transport objection, which is that the assessment answered a different question from the one the highway authority was asking.
PlanScope drafts transport documents structured to UK planning policy, with a "to be confirmed" flag wherever survey data is missing, and a reviewer from the professional directory can review and sign off the draft. 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.
Frequently asked questions
When is Transport for London consulted on a planning application?
Where a development affects the Transport for London Road Network, where the application is referable to the Mayor under the Town and Country Planning (Mayor of London) Order 2008, and where the site sits over or beside London Underground, Docklands Light Railway or safeguarded land. Boroughs usually consult on all applicable routes at the same time, and the responses come back separately.
What is the TLRN?
The Transport for London Road Network is the set of London's most heavily used roads, managed by Transport for London rather than by the boroughs. They are marked as red routes, with red lines instead of yellow ones and stricter stopping rules. Highway works on them are agreed with Transport for London under section 278 of the Highways Act 1980.
Can I load on a red route?
Only in a marked bay, or outside the controlled hours. Red lines prohibit stopping entirely during the hours shown, including for loading, which is stricter than a yellow line where loading is normally permitted. That has a direct effect on how a commercial unit is serviced, so establish the restriction before designing the servicing arrangement.
What does Healthy Streets mean for a transport assessment?
London Plan Policy T2 frames transport around the ten Healthy Streets Indicators, covering pedestrian comfort, shelter, air quality, places to rest and perceived safety. Assessments are expected to address those rather than vehicle capacity alone, using tools such as pedestrian comfort level analysis. Agree the method with the borough and Transport for London before the surveys are done.
How is car-free development secured in London?
Normally through a section 106 obligation preventing future occupiers from applying for residents' parking permits. A statement of intent in the application is not enough. Where the borough has no controlled parking zone covering the site, it may ask the applicant to fund the introduction or extension of one as part of the obligation.
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.