The images display two road tunnels constructed in different time periods, highlighting their depth, length, cost, structural design, and surrounding environment.
Overall, it is evident that the second tunnel, built between 2002 and 2006, is more advanced, longer, and deeper compared to the first tunnel, which was constructed from 1986 to 1998. The latter incurred a significantly higher cost and has greater traffic capacity.
The first tunnel is 2.2 kilometers long and lies 1.5 meters beneath a riverbed composed of sand. It consists of two separate lanes, each carrying two lanes, each carrying two lines of traffic in one direction. The construction of this tunnel spanned 12 years and cost 555 million.
In contrast, the second tunnel, completed over four years, is 3.6 kilometers in length and runs 2.5 meters below an urban area with a base of stone and clay. Despite the shorter construction period, it required a larger budget of 1.1 billion. Structurally, it is more advanced, consisting of two larger tunnels, each allowing three lanes of traffic, which suggests a design focused on higher vehicle capacity and improved flow.