A full weekend closure is planned for from 9pm Friday 12 July until 6am Monday 15 July.
The M25 between junction 10 and 11 will be closed in both directions to lift 68 concrete beams, each weighing 16 tonnes, and another four beams weighing 40 tonnes into place for the new western gyratory bridge.
General advice is only travel if necessary.
While the M25 is closed between junctions 10 A3 (Wisley) and 11 A320 (Chertsey), motorists travelling clockwise will be diverted from the M25 at junction 10 to use the A3 northbound travelling via the A245 at Painshill and the A320 to rejoin the M25 at junction 11.
Motorists travelling anti-clockwise will be diverted from the M25 at junction 11 to join the A320, then the A245 to Painshill to use the A3 southbound to rejoin the M25 at junction 10.
For all the details see M25 junction 10 (National Highways).