The given illustrations đepict details about two different road tunnels in an Australian particular city.
Overall, Tunnel B is built to reduce congestion and lower traffic density on the road and has a longer and taller structure than Tunnel A, which connects two parts of a city. Additionally, the capacity of Tunnel A is much lower than that of Tunnel B.
Tunnel A possesses 25 meters in height and 3.6 kilometers in length. It was constructed underground, beneath a body of the water, under the layer of stone and sand, taking 5 years to complete from 1987. It consists of a twin tube, each capable of holding a maximum of 1 truck and a car, costing at 556 million.
As for the remaining tunnel, Tunnel B is much more modern, erected from 2004 to 2007 at twice the cost of Tunnel A, totalling 1.1 billion. It is 10 meters higher and 1.4 kilometers longer than Tunnel A, it is a subterranean structure with a twin tube and a larger capacity, holding 2 cars and 1 truck in each lane.