MOTORISTS are being warned about an overnight closure on the M25 this weekend.

As part of widening work on the motorway, the anti-clockwise carriageway will be closed between Junction 21a (Bricket Wood) to Junction 19 (Watford) from midnight on Saturday to 6am on Sunday.

The closure will allow the Highways Agency to install a gantry on the carriageway.

A signed diversion will be in place via the A405 to the A41 to rejoin the M25 anti-clockwise at Junction 19 or continue on the A41.

Residents in the area of the diversion route are advised there may be extra traffic during the closure.