What is the average speed on a US highway?

The average speed from New York to Washington DC is 43MPH which hasn't change in the last 25 years. That should give you a idea of the Interstate avg speeds. One must account for traffic, road condition, normal congestion in high traveled areas. If you mean the average speed limit, it's probably ...

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What is the human environmental interation for Europe?

apples are not oranges.

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