[exue]

If Canada is like the U.S., the median traffic speed on those roads you mentioned is greater than the speed limit. Thus it's really not a minority/extremely "can't say" opinion you're espousing, but you're right that there will usually be a (smaller) group of very vocal opponents

[tempestn]

It's a strange dichotomy, but at least in my experience it almost seems like although most people drive faster than the speed limit, most are also instinctively against the idea of raising those limits. (Perhaps because the majority of people believe themselves to be better than average drivers.) Or maybe they believe that people will simply continue to drive faster than the limits even if they were raised, so the status quot is preferred. If that's the case though, surely there's a better solution.