The maps compare two road tunnels in two cities in Australia, one eracted in 1986- 1998 and the other in 2002-2006.
As observed, although these two tunnels are enclosed, they serve different purposes, with one connecting two banks of a water body and the other working as an underground road. The costs and times also vary for the construction of these tunnels.
The differences are seen in the designs of these tunnels as one is a curved tunnel and the other is a normal underground road. Furthermore, the former is drilled beneath the layer of sand, whereas, the latter is drilled through layers of clay and stone. Also, these two tunnels present the differences in their parametres, as the curved tunnel is 1.5 metres high and 2.2 kilometres long while the other tunnel is 2.5 metres high and 3.6 kilometres long.
Cutaways of these two tunnels show the curved one has two entrances while the other one is a 3-lane tunnel. It took 12 years for the construction of the curved tunnels, with the cost being $555 million. The building time needed for the second tunnel was 3 times shorter relative to that of the curved tunnel, with a nearly doubled cost ($1.1 billion).