Speed limits depend more on the road (banking in corners, surface conditions, imperfections) and the car (what happens to the vehicle if an accident does happen) than the drivers, so I wouldn't expect major increases in speed limits.
I doubt that or else you wouldn't see the same stretch, and grade of road get two different speed limits depending on what side of the state border that you are on.
Additionally, on the intrastate highways, the speed limits are set by local districts so local districts who like making money will often change their speed limit for any highways that go near by them so they can speed trap people.
