The maps show two different underground tunnel systems for cars in two Australian cities

The maps compare two different underpass systems for cars in Australia in two different cities.

Overall

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, there are a number of differences between the two

tunnel

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systems

,

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in terms of cost, size, length, time of reconstruction, and the surrounding environment. The

first

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tunnel

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was significantly smaller by size than the second

tunnel

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. The

first

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tunnel

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, which took twelve years from 1986 to 1998, cost $555 million

,

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and was built underneath a body of water and sand. Meanwhile, the second

tunnel

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only took 4 years from 2002 with the cheapest cost at only $1,1 million, and was constructed beneath a layer of stone and clay.

Furthermore

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, there are substantial differences by size, with the

first

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tunnel

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being 1.5 meters high and 2.2km long and the underpass being 2.5, high and 3.6 km long.

In addition

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, the

first

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runner system is four lanes wide,

while

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the underpass system is six lanes wide