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Europe March 21, 2026

London’s A40 is closed for a month – here’s the impact it will have

London’s A40 is closed for a month – here’s the impact it will have

A major artery into central London has been severed, and the repercussions are already being felt across the city. The A40, a vital route for nearly 100,000 vehicles daily, is now closed between the Westway roundabout and Marylebone flyover for essential engineering works – a closure predicted to last just over a month.

The immediate impact is a looming threat of gridlock. Drivers are bracing for significantly longer commutes, with estimates suggesting journeys could increase by 50% or even double. The closure isn’t just an inconvenience; it’s a disruption to daily life, severing connections for families and impacting businesses reliant on smooth transport.

“This is going to be an absolute nightmare,” lamented a resident of Maida Vale, voicing the anxieties of many. “I have family in southwest London, and getting to them will be a struggle. We are trapped.” The sentiment echoes throughout west London, where the closure is viewed as a potential catastrophe for already congested roads.

Heavy traffic builds up on the A40 at Perivale, West London on a day of rail strike action.

The ripple effect extends far beyond the immediate vicinity of the A40. Experts warn that traffic won’t simply vanish; it will divert, overwhelming surrounding routes and exacerbating existing congestion. The North Circular (A406) is expected to bear a heavy burden, as drivers seek alternative paths.

Key areas are predicted to become pressure points. Marylebone and Paddington, directly beneath the flyover, are bracing for standstill conditions. Westway Roundabout will be a major bottleneck, impacting access to Westfield and Shepherd’s Bush. Even further afield, the A4 corridor towards Hammersmith and Chiswick is anticipated to experience a substantial surge in traffic.

Local roads are also expected to suffer. Scrubs Lane, Wood Lane, Uxbridge Road, and Westbourne Grove are all likely to become congested as drivers attempt to navigate around the closure. The situation is compounded by ongoing roadworks elsewhere in the city, creating a perfect storm of traffic chaos.

An aerial shot showing the A40 Westway flyover route in London.

Public transport isn’t immune to the disruption. Dozens of bus routes are predicted to face delays, adding to the frustration of commuters. The Oxford Tube coach service, connecting London Victoria and Oxford, has already warned passengers to expect increased travel times.

The Licensed Taxi Drivers Association has pointed to the closure as further evidence of London’s escalating congestion problem, currently ranked as the fifth most congested city globally. Concerns are rising that the situation will worsen, potentially pushing London to the top of that unwanted list.

Even businesses are feeling the strain. A restaurant owner in Marylebone expressed worry about the impact on Eid celebrations, anticipating fewer customers due to the difficulty of reaching the area. The closure represents a significant challenge for businesses reliant on accessibility.

While transport authorities state the work is scheduled during a quieter period, the reality on the ground suggests a month of significant disruption lies ahead for Londoners. The closure of the A40 is more than just a road closure; it’s a test of the city’s resilience and a stark reminder of its dependence on a complex transportation network.

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