|Location Map ( geo)|
|Roundhill Tunnel Westbound portal in Winter.|
|Crossings related to the A20|
|Crossings related to the E15|
Dover - Calais ferry • Channel Tunnel • Arrows Bridge • Coquet Viaduct • Blaydon Bridge • Alnwick Viaduct • Tomatin Viaduct • Edendon Bridge • Dalreoch Bridge • Dalnaspidal Bridge • Coronation Bridge (Pitlochry) • Alvie Bridge • Almond Bridge • Daviot Bridge • Pass of Killiecrankie • Forth Road Bridge • Thelwall Viaduct • Mossband Viaduct • Metal Bridge • Lune Bridge • Dartford Tunnel • Queen Elizabeth II Bridge • A9 Garry Bridge • A9 Spey Bridge • Dalmagarry Bridge • Samlesbury Bridge • Berwick Bypass Bridge
The Roundhill Tunnel are a pair of bored tunnels in Folkestone in Kent. They were built as part of the general works for the Channel Tunnel. The tunnels themselves are a D2 arrair and are bored into a chalk hill. The building works took three years to do. The western portals are on a pair of viaducts that take you to the Castle Hill Interchange.