An articulated lorry has broken down on the A339 southbound (From the M4 and Vodafone) at the entrance to the Robin Hood roundabout.
Currently blocking lane one of three, however, a tyre company are en route and the repair will require a second lane to be closed.
This will cause considerable delays moving towards the evening peak and drivers are advised to find an alternative route into the town centre.
West Berkshire Council anticipates 90 minutes to clear.
