The diagrams illustrate data regarding the two tunnels that were built in an Australian city. Overall, there are significant differences between the two tunnels in terms of distance, cost, and development time.
Tunnel A was constructed earlier, with its development period spanning from 1987 to 1992. It features a twin-tube cross-section. Additionally, the distance from one end to the other is approximately 2.2 kilometers, and the underground depth reaches up to 25 meters. Notably, the cost of Tunnel A was around 556 million dollars.
In contrast, the development of Tunnel B began in the 21st century, with construction starting around 2004 and completed in 2007. The overall cost for Tunnel B was 1.1 billion dollars, which is roughly double the cost of Tunnel A. Tunnel B also has a twin-tube cross-section but with a larger width area. Its underground depth is 35 meters, and it covers a total distance of 3.6 kilometers.