M20 Chaos: Diesel Spill Shuts Down Roundhill Tunnel, Massive Delays & Diversions Explained (2026)

Morning commuters, brace yourselves: a major disruption is snarling traffic on the M20. A significant diesel spill has forced the closure of the coastbound Roundhill Tunnel near Folkestone, leading to extensive delays.

Traffic cameras paint a grim picture: a lengthy queue of eastbound vehicles stretches back, including numerous lorries destined for the Port of Dover. Drivers are being diverted off the motorway at junction 13, adding time and frustration to their journeys.

The designated diversion route guides motorists along Churchill Avenue and Canterbury Road before rejoining the A20.

National Highways South East has deployed specialist contractors to address the hazardous situation. But here's where it gets controversial... The tunnel's reopening hinges on the complete treatment of the affected carriageway, ensuring it's safe for all traffic.

In related news, Kent Highways reports an accident causing delays on the southbound A249 between the A2 (Keystreet) and the M2 Junction 5 (Stockbury).

Adding to the morning's woes, there's also been an accident on the M25 clockwise between Junction 3 (M20 Swanley Interchange) and Junction 4 (Badgers Mount). Emergency services are on the scene.

And this is the part most people miss... These incidents come after several days of sub-zero temperatures, with snow, ice, and frost creating treacherous road conditions throughout the county.

Stay informed with the latest travel updates by tuning into kmfm. We'll provide more details as they become available.

What do you think? Are you affected by these delays? Share your experiences and thoughts in the comments below!

M20 Chaos: Diesel Spill Shuts Down Roundhill Tunnel, Massive Delays & Diversions Explained (2026)

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