The DOT cannot simply go out and slap up a fresh new set of 85-mph speed limit signs. Both engineering and traffic studies must be done before motorists are given a green light to those increased speeds. Don't feel too bad for those speed-restricted Texans, though. 85 mph wouldn't be much of a stretch for Texas, since the state already enjoys 520 miles of highway with an 80-mph speed limit.
[Source: Chron.com | Image: University of Michigan]