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Speed restrictions are now in place for motorists heading into Dover.
Highways England has confirmed Dover Traffic Access Protocol (RAP) is now in place on the A20 at Aycliffe due to heavy freight volumes.
A statement from the agency said: "This is to prevent port-bound traffic from disrupting the local road network and the A20 through Dover town.
Motorists must not exceed 40mph from the Roundhill Tunnel to the traffic lights at Aycliffe. The lights will signal to port bond HGVs when they can move forward through the town.
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