TfL to start £10.8m Brent Cross flyover repair, four years after weight limit

Transport for London is due to start renewal works on the A41 Brent Cross flyover on 24 September 2026, funded by £10.8m from the Department for Transport, nearly four years after it put a 7.5-tonne weight limit on the structure.

TfL's release of 14 August 2026 describes the £10.8m as covering the first phase of the wider Brent Cross Interchange renewal programme. It gives no total cost for that programme.

When TfL announced the weight limit in October 2022, it said it "continues to work closely with the Department for Transport to secure up to £50m funding for this project from its Major Road Network Programme". The £10.8m now allocated is about a fifth of that figure, and neither release says what became of the bid.

The papers that would record its fate are out of reach. TfL's governance page lists a Programmes and Investment Committee whose papers sit on a board papers site that could not be reached from the desk, and the department's Major Road Network pages could not be reached either.

On how many vehicles this affects, the 2026 release states: "The A41 Brent Cross Flyover is one of London's most important road structures, with more than 120,000 vehicles using the wider Brent Cross Interchange every day." That figure covers the interchange rather than the flyover alone. The 2022 release describes the flyover as "around 190m long and carries the A41 dual carriageway over the A406 North Circular", in Barnet.

From 24 September the flyover drops to one lane in each direction, and TfL says the works will run for up to two years. Overnight and weekend closures follow during construction, with signed diversions using the A406, the A5 Edgware Road and the A1.

TfL's project page for the scheme puts the festive pause between late November 2026 and early January 2027, and describes the work as strengthening the structure, replacing safety barriers and installing new waterproofing.

The limit that prompted all this began at 00:01 on Tuesday 11 October 2022. TfL imposed it after safety checks during a refurbishment found that "the maximum weight that the structure is able to carry is lower than previously assessed", with over-limit vehicles sent on a signed diversion "via the A406/A41 Brent Cross elevated mid-level roundabout".

The 2026 release states: "The completion of work will allow heavy goods vehicles back on to the road, with a 7.5 tonne weight restriction being lifted once complete." If the works run their full two years, the limit will have stood for close to six years.

TfL's improvements and projects index now carries a page for the scheme, alongside pages for the Gallows Corner flyover refurbishment, the Lodge Avenue flyover replacement, the A40 Westway and the River Lea Crossing. That page gives the same £10.8m and the same dates as the release.

The release says TfL will work with bus operators, freight partners, taxi and private hire services, boroughs and community groups during the works. Neither the release nor the project page names a bus route affected by the lane reduction.

Stuart Harvey, TfL's Chief Capital Officer, is the official quoted in the release. Glynn Barton, then TfL's Director of Network Management, was quoted when the weight limit went on in 2022.