Check out this section of 5, litterally over 100 miles of nothing in a state with more population than most contries. Exits are about 10 miles apart, and most of the time visability is good enough that you can spot trouble 20 miles before you get to it. I think the Germans have it right with speed limit signs that change with conditions. Good and prudent is a legal cop-out for limiting liability, not actually safety. Anyway, my point is that on this stretch, if 55 were mandated more would die from falling asleep than would be saved by the slower speed elsewhere.
http://maps.google.com/maps?f=d&hl=e...e=UTF8&t=h&z=8
James
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