The Heysen Tunnels are twin tube road tunnels which carry the Adelaide-Crafers Highway under Eagle On The Hill in the Mount Lofty Ranges in South Australia. The tunnels were excavated using a tunnelling machine normally used in heavy-duty mining operations which tunnelled through 500 metres of rock for each tunnel at an average rate of 3 metres per day. The tunnels were completed in 1998 and officially opened in May 2000. Each tunnel carries 3 lanes of traffic.
The tunnels are named after artist Sir Hans Heysen.
- "Heysen Tunnels Construction". Government of South Australia, Department for Transport, Energy and Infrastructure. 13 August 2004. Archived from the original on 2007-08-31. Retrieved 2007-07-14.
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