The given illustration picts two distinct underground roads for vehycles in two cities in Australia.
Overall, we can see though thoses pictures that the oldest underground way was built to let a maximum of 2 cars riding side by side whilst the other can let 3 cars like that. Futhermore, it was constructed under a bridge while the more recent one was made below a downtown.
In the first city, the road which is located below the ground has been constructed from 1986 to 1998. The total amount for this project was 555 millions of dollars. This canal was dug on 1,5 meters of width and 2,2 meters of lenght below a bridge that was built over water and sand. it can permit the traffic of only 2 cars, one being beside the other.
The newest one is below an area with a lot of traffic and buildings. It was set up during 4 years, from 2002 to 2006 and, compared to the oldest one, costed much more money whith an amount of 1,1 billions of dollars. it has been erected on 2,5 meters of depth to 3,6 meters of length.
