A traffic “incident” on M25 clockwise is causing commuter misery.

Three lanes, including the M40 slip road, are closed between J15 (M4/Slough) and J16 (M40/Uxbridge) and drivers are being warned of long delays, while a HGV is awaiting recovery.

Commuters are being asked to allow extra travel time and are being encouraged to use alternative routes if possible.