Work is being carried out on Cromwell Road Railway Bridge, which carries the A4 Great West Road over a railway line between Chiswick Roundabout and Hogarth Roundabout.
There will be a series of lane closures and full directional closures on the A4 between Chiswick roundabout and Hogarth roundabout, which will also at times affect the M4 between junction 3 and Chiswick roundabout.
All full directional closures will take place overnight or at weekends. On weekdays, there will be at least 1 lane open for traffic in both directions.
The first closures take place over Saturday 6 – Sunday 7 August. For full details please visit the TfL website: