The diagram provides information about different road tunnels in two cities of Australia.
Overall, it is clear that there are several significant differences in the systems of two tunnels, such as construction cost, time, size, length and infrastructures surrounding.
It is clear that it took around a 5-year period, from 1987 to 1992 to complete tunnel A while tunnel B only needs roughly a 3-year period, from 2004 to 2007. In addition, the expense of construction tunnel B was more than almost twice as much as tunnel A, with 1. 1 billion and 556 million respectively. Furthermore, each twin tube of road tunnel A can contain two different means of transport, including truck and car, whereas tunnel B can accept three vehicles moving at the same time.
In terms of design, it can be seen that the facilities of tunnel B were significantly superior compared to tunnel A. Notably, the size of the second tunnel was 35 meters high and 3. 6 kilometers long, which is roughly larger by 10 meters high and 1. 4 kilometers long compared to the first tunnel. Tunnel A is constructed underneath the water and sand while tunnel B is built under a fully stone and sand layer.