Drivers in north London face up to two years of delays and disruption as a £10.8 million programme to repair and strengthen the A41 Brent Cross flyover gets under way this week.
Transport for London says the main phase of traffic management begins on the evening of Wednesday 30 September, when the flyover will be reduced to a single lane in each direction. The works are expected to continue for up to two years as engineers strengthen the structure, replace safety barriers and install a new waterproofing system.
The programme has received £10.8 million of funding from the Department for Transport, and is designed to restore the flyover to full load-bearing capacity — allowing TfL to finally lift the 7.5-tonne weight restriction that has been in force since October 2022.
Lane closures and contraflow on the flyover
From Wednesday night, motorists using the flyover will be squeezed into one lane each way, with reduced road space and longer journey times expected on the A41, the A406 North Circular and surrounding roads.
Reports suggest the squeeze will tighten through October. Lane restrictions are expected on the A41 Hendon Way between 1 and 28 October, before a contraflow system comes into force on the flyover itself from 29 October.
Overnight closures are also planned. The A406 North Circular westbound is set to shut overnight on Wednesday between 10pm and 5am, while the A41 Hendon Way faces overnight closures later in the week between the Vivian Avenue and The Vale junctions. TfL says signed diversion routes will be in place, with residents and road users updated in advance of each stage.
What drivers should do
Motorists are being urged to plan ahead. TfL has advised drivers to avoid the A41 and A406 Brent Cross area where possible, to check its dedicated travel advice page before setting out, and to allow plenty of extra time for journeys through north London.
Public transport may be a better bet for some trips while the restrictions bite, and drivers who must use the roads are advised to follow the signed diversions rather than rat-running through residential streets. Night-time drivers should check for overnight closures before travelling — London is facing a wave of planned shutdowns this week, including every M25 closure this week and a full list of A2 closures and overnight roadworks.
TfL has also confirmed the works will pause between late November 2026 and early January 2027 to keep Brent Cross Shopping Centre accessible during the festive season — offering drivers a brief respite before the programme resumes in the new year.
Why the weight restriction was brought in — and what lifting it means
The 7.5-tonne limit was imposed in October 2022 as a safety measure after assessments showed the ageing structure needed protection from heavy vehicles. For the past four years it has kept lorries and other heavy traffic off the flyover, forcing freight onto longer routes around one of north London’s busiest junctions.
Removing the restriction is the ultimate prize of the £10.8 million programme. Once the strengthening work is complete, the flyover will be restored to full load-bearing capacity — reopening the crossing to heavy goods vehicles, improving reliability for the businesses that depend on it, and reducing the risk of sudden unplanned closures and emergency repairs.
TfL calls the crossing “one of London’s most important road structures” — a vital strategic route for people, businesses and freight connecting communities across north London and beyond. More than 120,000 vehicles use the wider Brent Cross Interchange every day.
A two-year programme to future-proof the crossing
Alongside the strengthening work, engineers will replace safety barriers on the flyover and its approach ramps, and install a new waterproofing system designed to extend the life of the structure.
TfL says the investment will allow the flyover to “serve Londoners reliably for decades to come”, cutting the risk of the kind of emergency repairs that cause the worst disruption — unplanned, with no warning.
The Brent Cross scheme is not the only long-running flyover repair programme in the capital — the Gallows Corner flyover has only just fully reopened after £67.4 million of improvement works, showing how lengthy structural renewals can be.
Full details of the works, including traffic impacts and changes to local roads, are published on TfL’s official Brent Cross flyover renewals page.
