A section of the M25 will be closed tonight and Sunday morning as engineers install a new gantry.
The anti-clockwise carriageway between Junction 17, for Maple Cross, and Junction 16, for the M40, will be closed between 11pm on Saturday and 5am on Sunday.
The slip roads from the anti-clockwise M25 to the M40 and from the M40 to the clockwise M25 will also be closed for the work.
Anti-clockwise traffic will be diverted off the M25 at Junction 17 onto the A412 towards the A40 at Denham, then west on the M40, before returning to the M25 at Junction 16.
M40 traffic for the clockwise M25 will be diverted to Junction 14 of the anti-clockwise M25 to return on the clockwise carriageway through Junction 16.
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