This closure is in place to prevent traffic jams in the Roundhill Tunnel as a result of the Port of Dover’s implementation of Operation TAP.
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Dover TAP is a temporary traffic management system that queues port-bound lorries in the nearside (left) lane of the A20 after the Roundhill Tunnel to keep Dover from becoming congested and to help improve air quality. This ensures that the town is kept clear of stationary port-bound traffic when the port is down. All vehicles approaching Dover from the west via the A20 are subject to a 40mph speed limit.