Heysen Tunnels
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LocationAdelaide Hills south east of Adelaide
Route
South Eastern Freeway (2017-present)
South Eastern Freeway (2000–2017)
South Eastern Freeway (2017-present) 
South Eastern Freeway (2000–2017)Constructed1998
Opened5 March 2000
 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.
Operation
Each tunnel carries three lanes of traffic. As at 2015, 45,700 vehicles passed through them daily.[1] The maximum height of vehicles permitted in the tunnels is 5.3 metres (17 ft), the same as the Crafers and Mt Osmond interchanges. Laser height detectors monitor traffic to provide warnings to drivers before they attempt to enter the tunnel.[2]
The tunnels are named after artist Sir Hans Heysen.
