Works that began in January 2019 will continue through to the summer.

All roads around Gunnersbury Avenue will stay open during the works and there will be access to properties. However, some temporary lane closures will be needed and the area may be busier than usual.

What we are doing

We developed proposals to improve safety on this section of the A406 North Circular because of the number and severity of collisions and near misses there.

The changes will include:

  • Extending the central reservation island between Power Road and Park Way to separate opposing traffic lanes, ensuring vehicles can't use oncoming lanes to overtake. This will also remove the risk of collisions involving right-turning vehicles
  • Making lane widths consistent to allow motorcyclists to filter safely
  • Permanently lowering the speed limit - from 40mph to 30mph - to make it consistent along the A406 Gunnersbury Avenue
  • Improving cycle and pedestrian sections on the Gunnersbury Avenue western footway to match the segregated facilities on Power Road Bridge

Planned works

To minimise the overall impact of construction we will do the work in three phases:

  • Phase one (Completed): move the kerb on the eastern side of Gunnersbury Avenue (between Park Way and Power Road Bridge) to widen the road, providing space for the new central island - this will involve digging down into the ground and diverting underground utilities (such as water pipes and electrical cables) and installing the new kerb line. This ongoing work should continue until early March 2019
  • Phase two: extend the central reservation from Power Road to Park Way. Works starting from 23 April 2019 are scheduled to last until 27 May 2019 - after 23 April it will no longer be possible to make a right turn onto the A406 Gunnersbury Avenue from any side road between Chiswick Roundabout and Park Way. This is a permanent change
  • Phase three: resurface the road and install new road markings between Park Way and the Chiswick Roundabout

We will update this page with details and dates of phase three nearer the time.

How your travel might be affected

  • We will work seven days a week, 07:30-17:00 on weekdays and 09:00-17:00 at weekends, to complete the scheme as quickly as possible
  • During phase two - 23 April until 27 May 2019 - the A406 Gunnersbury Avenue will be reduced to one lane in each direction. Expect delays if driving, especially during morning and evening peak hours
  • We plan to reopen all four lanes of traffic after 27 May 2019. However, we will need to close lanes at various stages throughout the remainder of the project to complete the works. Check back here for more information nearer the time
  • We may need to change the way traffic is managed at various stages throughout construction so our contractors have a safe workspace

To stay up-to-date and avoid disruption to your journey check on or follow @TfLTrafficNews on Twitter.

Pedestrians and cyclists

Pedestrians and cyclists will have access along the A406 Gunnersbury Avenue at all times. Any temporary changes will be clearly signed.

Minimising noise and disruption

Normal working hours are 07:30-17:00 on weekdays and 09:00-17:00 at weekends. All working times are agreed with the London Borough of Hounslow.

We will make every effort to reduce noise and disruption where possible. However, some noise is unavoidable.

Our partners

We are working on this project in partnership with Conway Aecom.

We are working closely with the London Borough of Hounslow to minimise disruption and ensure the works proceed as safely, efficiently and as quickly as possible.


We consulted on these plans in early 2016. Our consultation summary report can be found on the A406 Gunnersbury Avenue consultation page. 75% of people who responded said they supported or partially supported our proposals.