Intersting! I know that in the contiguous USA, you will never be more than 20 miles from a road no matter where you are, but have no idea how far one can drive from a town.
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(Assuming nothing kills you in nature)
Edit: Wait, no. You could be extremely unlucky and be walking parallel to the closest road, lol.
Nerd snipe 2. Same without a compass or any sense of direction. Assume you can accurately make a 90 degree turn and count steps
The latter - pick a direction, walk in a straight line.