The given maps are to describe two different underground tunnel systems for cars in two Australian cities.
Overall, there are several differences between the two tunnel systems, such as cost, size, length, time of construction, and the surrounding environment. The first tunnel costs lower as half as much and took much longer time when compared to the second tunnel to construct. However, the first tunnel was smaller in terms of length and vehicle capacity.
The first tunnel, which took twelve years to construct between 1986 and 1998, cost $555 million, and was built just below water and sand. Meanwhile, the second tunnel only took four years to be fully constructed but cost twice as much, at $1.1 billion, and was constructed under a street road followed by a layer of stone and clay.
The size of the tunnels was also significantly different, with the first tunnel being 1.5 meters high and 2.2 kilometres long, and the second tunnel being 2.5m high and 3.6 kilometres long. The first tunnel system is a four car lanes in its wide, whereas the second tunnel is comprised as a six car lanes.