It's not the cars abilities that you need to worry about as much as the design of the roads. I see lots of cars going 150+ here in Germany that I would never expect to be fine at that speed, but its the fact that the Autobahn is all controlled access (on ramps/off ramps) and people tend to follow the rules better. None of the secondary system has a limit over 100. Our Transcanada has crossovers and no end of places for people to intersect traffic and this is what makes it a problem to raise the limit.
The Coquihalla is a good example of a highway that could safely have a much higher limit.
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