The diagrams below give information about two road tunnels in two Australian cities. Summarize the information by selecting and reporting the main features and make comparisons where relevant.

The figures compare the changes of

two

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underpasses between both cities in Australia.

Overall

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,

it is clear that

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before the road is constructed citizens need to drive through the

tunnels

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, which have

two

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lanes

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each, located under the river.

However

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, it has changed to three routes per tunnel and the river has been replaced by the road. In the early years, people drove through the

tunnels

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which were built from 1986 to 1998 as another option of the way to commute

instead

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of the bridge. Each tunnel had

two

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lanes

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that were covered with sand and water from the river. The cost of construction was around 555 million dollars. The new

tunnels

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were built from 2002 to 2006 and the cost of construction was twice the previous method. These new

tunnels

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had milder slopes than the underwater option and they were extended from

two

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lanes

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each to three

lanes

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each. Both water and sand at the top of the

tunnels

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changed into stone and clay for building the road above the

tunnels

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.