A40 Westway

The Westway is a key strategic route and one of the busiest on TfL's road network. It's normally used by around 96,000 vehicles a day.

Major refurbishment work is now needed to keep the A40 Westway and surrounding road network running safely and reliably in the future.

What we're doing

In July 2020 we appointed a contractor to design a plan to:

  • Replace some large expansion joints
  • Introduce safety barriers at high risk places where the Westway crosses railways
  • Make essential concrete repairs in places along the A40 Westway

Lane restrictions and some partial closures of the A40 at night and on some weekends will help us do the work safely and efficiently.

Once the contractor starts the design work, we'll develop a traffic management plan. Check back here for details of proposed closures/restrictions and diversion routes.

Speed limit restriction

The speed limit was reduced in July 2020 from 40mph to 30mph along the entire stretch of the Westway between the A40 Northern roundabout to the west and Marylebone flyover to the east.

Slowing the speed helps protect and extend the life of the ageing expansion joints in the road until they can be replaced. This makes it less likely we'll have to close parts of the Westway for unplanned works.

Next steps

Our appointed contractor will develop the design, traffic management options and proposals for the refurbishment.

Given the scale of the structure, and that some sections are a higher priority than others, we plan to do the work in phases.

Along with the appointed contractor, we will work with interested parties to plan access and agree how to offset the temporary impact of the construction works.

Key elements of the work mean we will need to:

  • Replace the roller-shutter expansion joints
  • Replace comb expansion joints
  • Install safety barriers to protect parapets at high risk places (for example, over live railways)
  • Resurface and waterproof the carriageway where expansion joints are replaced
  • Repair concrete in some places
  • Investigate drainage
  • Investigate bearings

What we've done

a40 westway aerial


After a tender and selection process between March and June 2020, we appointed a contractor to move ahead with the next stage of this project.


After our March 2018 report on the investigations and options for maintaining and refurbishing the Westway and Marylebone flyover structures, a decision was made to go ahead with the project. Financial constraints at the time meant this was put on hold, but in December 2019 we decided to move forward with design and construction plans for the project.


Between 2015 and 2017 we inspected and surveyed all residential and business premises beneath the Westway to help us understand its condition.

We also surveyed different parts of the Westway elevated structures and Marylebone flyover, including the drainage, waterproofing, expansion joints, surfacing, structural concrete and parapets.

We investigated the road surface on the Westway and Marylebone flyover by digging trial holes, taking core samples and surveying the drainage system.

Aerial shot of A40 Westway

Contact us

Phone: 0343 222 1234 (24 hours)

(TfL call charges)

Call us if you have questions or comments about the scheme