I hate to believe this is coming, but here in Ontario we've been living with this limit for nearly 9 years and it's done nothing but **** off 4 wheelers. I get the finger for taking so long to pass a truck doing 62mph, or a truck going slower on a hill, because I can't do 75 like the car behind me wants to.
It's been fought here, and even rendered unenforceable by ruling of safety (how do you get away from a driver behaving strangely in front of you if you can't pass and drive away?) but the law remains.