The diagrams illustrate key information about two different tunnels, namely Tunnel A and Tunnel B, including their construction period, cost, size and structure. The figures are measured in kilometres and metres.
Overall, it is clear from the diagrams that Tunnel B is larger, deeper and more expensive than Tunnel A. In addition, both tunnels have a similar twin-tube structure, whereas Tunnel A is shorter and was built earlier than Tunnel B.
According to what is shown, Tunnel A was constructed between 1987 and 1992, with a total cost of approximately $556 million. It measures about 2.2 kilometres in length and is built at a depth of 25 metres below the surface. In terms of structure, it consists of a twin-tube design, allowing vehicles to travel in both directions separately.
In terms of Tunnel B, it was built later, between 2004 and 2007, and required a higher budget of around $1.1 billion. This tunnel is significantly longer, at approximately 3.6 kilometres, and is also deeper, reaching about 35 metres below ground level. Similar to Tunnel A, it features a twin-tube system, but it appears to accommodate more vehicles due to its larger size.