Works to construct two temporary slip roads onto the M25 between junction 16 (M40) and junction 17 (Gerrards Cross). This work is for High Speed 2 Limited to access planned site compounds for construction of the Chiltern Tunnel and Colne Valley Viaduct.
There are narrow lanes and a 50 mph speed restriction on the clockwise carriageway to provide safe access to the west of the site from the M25. Construction work is expected to run until Summer/Autumn 2018.
The slip roads, once constructed, are for HS2 construction traffic use only and will be in place for 8 to 10 years duration.