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Heysen Tunnels facts for kids

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Heysen Tunnels
Road leading out of the black opening of a tunnel
Portal of the Heysen tunnel
Overview
Location Adelaide Hills south east of Adelaide
Route South Eastern Freeway National Highway 1
Operation
Traffic automotive, including commuters and heavy freight
Toll N/A
Vehicles per day 45,700
Technical
Construction 1998
Length 500 metres (1,600 ft)
Number of lanes 3 in each tunnel
Operating speed 90 kilometres per hour (56 mph)
Tunnel clearance 5.3 metres (17 ft)

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. The tunnels were excavated using a tunnelling machine normally used in heavy-duty mining operations which tunnelled through 500 metres (1,600 ft) of rock for each tunnel at an average rate of 3 metres (9.8 ft) per day. The tunnels were completed in 1998 and officially opened in May 2000. Each tunnel carries 3 lanes of traffic. On average, they carry a total of 45,700 vehicles per day. 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.

The tunnels are named after artist Sir Hans Heysen.

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