One item that has not been mentioned yet is the change in automobile technology.
Speed limits in Canada have not changed or been reviewed in any significant way in decades.
However, cars are substantially safer in virtually every way: they break faster, turn better, tires are infinitely more reliable, sensors aid drivers, visibility is better, etc.
Despite these facts, speed limits remain where they were set in the 70s-80s when they were reduced in order to save fuel.
In the US, speed limits have been steadily rising on major highways over the last 10 or 20 years and in my purely anecdotal opinion, are far safer and more pleasant to drive on than the major Canadian highways.
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