The answer depends primarily on how wide the highway is and on what the concrete is used for: only the substratum or the surface as well.
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the definition is how much you spend per mile in cents.
The District of Columbia has the most lane-miles of highway per square mile (around 57). As for states, the highest number of lane-miles per square mile is Rhode Island at 13.
A kilometer is about 3/5 of a mile. There are 1.61 kilometers per mile.
it travels per mile
1 mile per hour is 1 mile every 3600 seconds. I mile per second is 3600 times faster than this hence, 3600 miles per hour.