The A20 Roundhill Tunnel in Kent is closed coastbound between the M20 (J13/A259/A2034) and the A260 near Folkestone. 

This closure is in place to prevent traffic queueing in the Roundhill Tunnel following the implementation of Operation TAP at the Port of Dover.

Dover TAP is a temporary traffic management system which queues port-bound lorries in the nearside (left) lane of the A20 after the Roundhill Tunnel to prevent Dover becoming congested with traffic and helping to improve its air quality. This ensures that the town is kept free of stationary port-bound traffic when the port is experiencing disruption. A 40mph speed restriction applies to all vehicles approaching Dover from the west via the A20.

National Highways have resources in attendance to assist with traffic management.

Diversion route

Road users are advised to follow the hollow black circle diversion symbol on road signs

  • Exit M20 at J13 and onto the A259 Churchill Avenue.
  • Travel east to the A260 Canterbury Road roundabout.
  • Take the first exit on to the A260 Canterbury Road and head north.
  • At the Spitfire Way roundabout take the third exit on to the A20 coastbound.

If this closure impacts on your planned route, please allow extra journey time. Plan ahead, you may wish to re-route or even delay your journey. 

Further information is available from National Highways by visiting our  www.trafficengland.com  website and travel apps, or via our regional twitter feed. Our 24/7 contact centre team is also available to provide up to the minute information on 0300 123 5000. 

By Ed

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