M4 improvement works

Highways England began work to deliver 32 miles of new smart motorway on the M4 a year ago. Progress is being made on the western section between junctions 8/9 to 12 and work has recently started on the eastern part of the scheme - closer to Buckinghamshire. The first bridge replacements are starting this autumn with work on the carriageway between junctions 3 to 4b also starting in September 2019.

From spring 2022, the completed smart motorway will increase capacity, reduce congestion and deliver more reliable journeys.

There are 11 bridges in the Slough, Windsor & Maidenhead and South Bucks areas that need replacing ito create space for the new four-lane smart motorway.

The first of these to be demolished will be Recreation Ground overbridge by Upton Court Park. This has closed from 9 September and pedestrians and cyclists are being diverted to Datchet Road during construction.

Work will be complete in late summer 2020 and access will be restored as soon as possible after then. Marsh Lane overbridge near Dorney will be demolished in mid-November and will be out of action until late 2020, with traffic diverted via Lake End Road.

There will be closures of the M4 over the weekends of 27-30 September (Junctions 5 to 6), and also 15-18 November and 29 November to 2 December (Junctions 6 to 8/9) to allow for the demolition and construction of bridges between junctions 8/9 and 5 with more to come in 2020 and 2021.

Read more in Highways England's latest newsletter.



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