This will eventually link Sydney’s suburbs, airport, north shore, and city centre. The land above the WestConnex Tunnel has mostly been given over to parks, playgrounds, and open space for the city’s inhabitants to relax.
WestConnex, Australia – 13.67 miles (22.0km)
The WestConnex Tunnel is the longest underground stretch of public road in Australia, and it’s thought to have cost A$10 billion (£5.1 billion).
This figure set a new record for transport spending by the New South Wales Government, and it’s estimated the fully completed project will come in at A$45 billion (£23.1 billion). However, the government also states the tunnel contributes to A$22 billion (£11.3 billion) in savings due to reduced travel time and journey reliability.
Lærdal Tunnel, Norway – 15.23 miles (24.51km)
Topping the longest road tunnels in the world is the Lærdal Tunnel in Norway. This 15.23-mile underground construction was started in 1995 and opened to the public in 2000. It took some 20 years to agree to the construction of the tunnel, which cost 1.1 billion Norwegian Kroner (£85 million) to complete, which represents great value in the world of roads tunnelling.
It was so much cheaper to build than most tunnels as the nature of the rock means the tunnel doesn’t need to be lined – and nor does it have to be made earthquake proof as they no not occur with any severity in Norway. The tunnel connects Lærdal and Aurland and consists of two tubes, each carrying traffic in a single direction for safety.
Lærdal Tunnel, Norway – 15.23 miles (24.51km)
While it’s the longest road tunnel in the world, the Lærdal Tunnel is also one of the most lightly used. On a typical day, it carries around 2050 vehicles, which is largely due to its remote location 180 miles to the northwest of Oslo.
To alleviate the monotony of driving through the world’s longest road tunnel – which is also straight throughout – this Norwegian project is divided into four sections, each separated by a large cave with parking areas. The caves have blue and yellow lighting to give the feel of a Norwegian sunrise, which is thought to give drivers’ brains a boost when they are tired. Police cameras have also been installed to combat speeding.
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