A4 Great West Road, under the M4 in Brentford, West London
We need to survey the concrete pillars which are part of the elevated section of the M4 in Brentford, West London. We will access the pillars at ground level from the A4 Great West Road, which is under the M4.
Latest updates
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14 April 2025
Survey work starts soon
We need to survey the concrete pillars that are part of the elevated section of the M4 in Brentford, West London.
To safely access the pillars from ground level, we will close sections of the A4 Great West Road, which is under the M4, overnight.
We have chosen overnight closures to minimise disruption as much as possible.
The A4 will be closed between 10pm and 5am:
Eastbound, between Ealing Road and the Chiswick Roundabout, from Tuesday 27 May for seven nights
Westbound, between the Chiswick Roundabout and Ealing Road, from Tuesday 3 June for seven nights
East and westbound, between Boston Manor Road and Ealing Road, on Thursday 12 and Friday 13 June
East and westbound diversion map
There will be overnight lane closures on the A4 east and westbound, at Ealing Road, on Tuesday 10 and Wednesday 11 June.
Please allow extra travel time if driving overnight. The road will be reopened by 5am each morning and remain open throughout the day.
Access for drivers
Fully signposted diversion routes will be in place overnight via the:
- Chiswick Roundabout and the A315 High Street, using the B455 Ealing Road or A3002 Boston Manor Road, depending on which section is closed
- A4 westbound to the Waggoners Roundabout and the A312. The Parkway northbound for access to the M4 via junction 3
For residents and businesses
Access to the side roads directly off the A4 where it is closed will be maintained for residents and businesses. Please speak to a member of our team on site who will escort you through the closure to your property when it is safe to do so. Our work will consist of visual inspections and hammer tap inspections which shouldn’t cause any major noise disturbance.
Bus services
We’ve made special provisions to safely escort buses through our closures, where required. This also applies to emergency services responding to incidents.
We plan to carry out further works here to keep the elevated section of the M4 safe and useable for the 100,000 people who use it each day. Please check back for updates.
Project information
Overview
We need to keep the elevated section of the M4 safe and useable for the 100,000 people who use it each day. This survey work will ensure we continue to do so. We have chosen overnight work to try to minimise disruption as much as possible.
Benefits
Our survey work will ensure we keep the elevated section of the M4 safe and useable for the 100,000 people who use it each day.
Documents
Traffic information
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