The map displays the two road tunnels of an Australian city which was built in 1987 to 1992 and another in 2004 to 2007.
Overall,the tunnel B is bigger than tunnel A which is also very expensive as compared to tunnel A . However, both tunnel represents the cross section twin tube tunnel.
Firstly, the tunnel build in 1987 costs about $556 millon. The tunnel is 2.2 kilometres long and 25 meters high . It is a cross section twin tube tunnel which will only include one vehicle at one time .
In 2004 new tunnel was started to built which was completed in 2007 which is very expensive than the tunnel build in 1987. It costs $ 1.1 billion to constructed. It is 35 meters high and 3.6 kilometres long which is comparatively bigger in size then the previous tunnel . Moreover, it contains many vehicles pass in the tunnel.