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$500,000,000 for the average highway. $500,000,000 for the average highway.
In road building, to make sure the road isn't too steep. Roof of a building has a slope so that rain will run off.
It depends on where in the world you are.
According to an world bank report, the cost per km of paving (black tar) a road is about $250,000/k.m. but constructing a new road is about $900,000/km. This is April 2000 data so probably the price is up by 5 to 15% by now. Ofcourse, the condition will vary greatly and so will the price.
Costs vary by geographic location.