If speed limits were uniformly and strictly enforced (rather than an occasional tax on the driver), there would likely be enough outrage to repeal them.
In some EU countries, they're uniformly and strictly enforced by automated radars. Think France, for instance. Best I'm aware, there's little outrage -- except from a very vocal group of reckless drivers.
Speaking for myself, I find it interesting that new generations of automated radars are becoming smart enough to reliably detect when a truck or a bus is speeding when their speed limit differs from those of automobiles, or when drivers fail to respect safety distances.