[usrusr]

The great thing isn't freedom, it's that the huge speed differences between cars help a lot with keeping drivers focused. People drive instead of just waiting out the time until their exit pops up on the nav. This effect has quite a bit of inertia so that even the speed-limited parts benefit from it so that a blanket speed limit would likely make the already limited sections less safe, after adapting to the relative ease of blanket speed limits. Chances are that overall safety would still increase, but I'm not sure of that (short term it would definitely increase, but that effect could quickly erode as people get used to it).