Long queues are building on a motorway as a key tunnel has shut in both directions due to a “technical issue”. There are delays on the M20 approach to the Roundhill Tunnel in Folkestone. National Highways has said shut down both sides of the carriageway, causing queuing traffic. A spokesman said: “The A20 Round Hill Tunnel in Kent is closed in both directions between A260 near Hawkinge and the M20/A259 near Folkestone due to a technical issue.” “Engineers are on scene to fix the issue.” Road users are advised to follow the hollow circle diversion symbol on road signs if heading eastbound. More…