The maps illustrate the construction of two underground vehicle tunnels in Australia, with the first built between 1986 and 1998 and the second between 2002 and 2006.
Overall
, the two tunnels are considerably different, with the more recent one being larger, more advanced, and far more expensive to construct.
The first tunnel was constructed from 1986 to 1998 and cost approximately $555 million. It measured 1.5 meters in height and 2.2 kilometres in length, allowing only two cars to travel side by side. Linking Words
This
tunnel was Linking Words
also
constructed through sand, running beneath a river, with the bridge situated above.
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In contrast
, the second tunnel was built through stone and clay between 2002 and 2006. It was significantly more expensive, with a total cost of $1.1 billion. It was situated beneath a major two-way highway in the city centre with numerous public facilities nearby. Linking Words
Moreover
, Linking Words
this
underground was longer at 3.6 kilometres, and one metre deeper than the earlier project. Linking Words
Additionally
, it was wide enough to accommodate three vehicles abreast.Linking Words