 The portal of one of the Heysen tunnels | |
| Overview | |
|---|---|
| Location | Adelaide Hills south east of Adelaide |
| Route |  South Eastern Freeway (2017-present)  South Eastern Freeway (2000–2017) |
| Operation | |
| Constructed | 1998 |
| Opened | 5 March 2000 |
| Traffic | automotive, including commuters and heavy freight |
| Toll | N/A |
| Vehicles per day | 45,700 (2015)[1] |
| Technical | |
| Length | 500 metres (1,600 ft) |
| No. of lanes | 3 in each tunnel |
| Operating speed | 90 kilometres per hour (56 mph) |
| Tunnel clearance | 5.3 metres (17 ft)[2] |
The Heysen Tunnels are twin tube road tunnels which carry the South Eastern Freeway under Eagle On The Hill in the Mount Lofty Ranges in South Australia.
- ^ Annual Average Daily Traffic Estimates 24 hour two-way flow (PDF) (Map). Government of South Australia, Department of Planning, Transport and Infrastructure. 1 March 2015. Map MT12. Retrieved 3 April 2015.
- ^ "South Eastern Freeway". Government of South Australia, Department of Planning, Transport and Infrastructure. 10 February 2015. Over-Height vehicles. Archived from the original on 8 April 2015. Retrieved 4 April 2015.