How many miles of road are in the USA?

Question:
For even more bonus points, in North America? Europe? Just curious.

Answers:

What is SIG Alert in California Freeways?

Tricky question. I don't know how many miles of road are in the USA, however, I can answer that question for the Interstate Highway system.
As of 2002, there was 46,747 route miles of interstate and 210,896 lane miles of interstate (counts the miles of each individual lane).

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Traffic in Indy?

there's a lot that probably no one can answer

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