The provided diagram delinates the two different type of road tunnels in two Australian cities constructed in seperate time period.
Overall, a cuorsry examination of the figures gives information that former tunnel was of low cost, narrower carriageway, smaller dimension ,more time requiring compared to later one.
On one hand, the older tunnel was constructed underneath a fiver to faciliate cross drainage mobility for a distance of 2.2 kilometers with tunnel height of 1.5 meters. this tunnel was dugged through sandy soil so, only two-lane width of two carriage in two tunnels were constructed. Construction took place from 1986 to 1998 with budget of $555 milllion.
On the other hand ,the later tunnel was constructed with the purpose to dillute traffic problem in road unlike different purpose of older one. It was dugged under preexisting road way for a distance of 3.6 kilometers in stone and clayey soil. Road was of upgraded capacity then older one of three-lane with two carriageway were built with two tunnels of 2.5 meters height. This tunnel was comissioned from 2002 to 2006 ,in comparatively short beriod then former one meanwhile there was about two times increase in capital expenditure for the project.