Drivers have been warned of delays on a busy dual carriageway after a rush-hour crash. The A21 Tonbridge Bypass at Sevenoaks Weald has been partially blocked southbound. Queuing traffic is causing delays in the area following an incident at about 5pm. The road is blocked between the A225 Hildenborough and Sevenoaks junction and the A26 turn-off for Tonbridge. It is not yet known whether anyone has suffered serious injuries.