M4 Smart Motorway Works

September will see the start of the construction phase of making the M4 into a Smart Motorway.

Indicative timing of the works
This is the longest smart motorway project in England to date (51km, 32 miles). To minimise disruption there will be a need to work on different stages at different times.

The current intention for the phasing of construction, is to start at junction 8/9 and progress west towards junction 10. In tandem work will begin on four bridges between junction 8/9 and junction 7. The more complex section of the scheme, progressing east from junction 8/9 towards junction 3, will be started in May 2019.

The table below indicates which sections of motorway are expected to be worked on at any given time.

Timetable subject to governance, funding approval and discharge of the Development Consent Order (DCO):

Link Start End
Junction 12 – 11 May 2020 February 2022
Junction 11 – 10 May 2020 January 2022
Junction 10 – 8/9 September 2018 May 2020
Junction 8/9 – 6 May 2019* December 2021
Junction 6 – 5 December 2019 March 2022
Junction 5 – 4b October 2019 March 2022
Junction 4b – 3 January 2020 March 2022


Highways England will be running the following* Public Information Exhibitions to help with ensuring you receive information regarding the works. Highways England representatives along with the design and construction teams will be available at each exhibition to discuss the scheme and answer your questions.

You can also view the Public Information Exhibition leaflet to get more information about the events.


Date Time Venue Address
Saturday 7 July 2018 10am to 1pm Holyport War Memorial Hall Holyport, Maidenhead, SL6 2NA
Wednesday 11 July 2018 3pm to 8pm Sindlesham Court Sindlesham, Wokingham, RG41 5EA
Thursday 12 July 2018 2pm to 7pm Dorney Village Hall Dorney Reach, Maidenhead, SL6 0DS
Friday 13 July 2018 3pm to 8pm Theale Village Hall Theale, Reading, RG7 5AS
Monday 16 July 2018 2pm to 7pm The Nicholsons Centre Nicholsons Lane, Maidenhead, SL6 1LB
Thursday 19 July 2018 9am to 8pm The Oracle Shopping Centre Reading, RG1 2AG


*July 2018 exhibitions are taking place around M4 junctions 7 to 12 where construction on this scheme will start. Further engagement will take place around junctions 3 to 7 in due course.

Further information can be found on the project’s website.