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.
An archeologist would walk down a gradient until they find a stream and therefore a fluvial network to a human settlement.
Your answer gets me killed.