Speeds have been pretty much established following these guidelines.
Optimal fuel efficiency as set in the mid-1970's (highways).
Engineered road-design tolerances that are based upon the optimized speed limit and volume of vehicles using the roads, vs the wear and tear expected/experienced, minus a 20% safety cushion. Simply put, the more vehicles travelling the road, and the faster the vehicles are going, the quicker the road deteriorates. Roads cost money to build, maintain, and rebuild.
Speed limits are also influenced by statistical analysis of accidents/incidents over time.
Median abilities of the average Ontario driver as compared to other areas of the world .. lets face it, the term 'mediocre' comes to mind very quickly. Throw the legalized speed-demons into the mix with those fresh from the Crackerbox Driver's Acadamy, and Joe Old Fart who can't keep between the lines at 90 km/h.. recipe for incrimentally increasing disaster as the speeds would theoretically be correspondingly increased, as per the present state of Ontario's licencing standards. The phrase 'vehicular bloodbath' comes to mind..
So we should ignore the fact that all residences/businesses/communities/regions are serviced by roadways, and that those inordinately affected should just STFU? What does it matter if a road has 10 houses alongside of it, vs 100? We all pay into the road tax system equally - and i'm sure that 90% of us who pay taxes in would not appreciate vehicles screaming by at inappropriate rates of speed and sound volume. This applies whether we live in housing subdivisions, alongside the highway (those highway barriers aren't just for vehicles to play vehicular pin-ball..) or in rural areas that are "lightly inhabited".
Unless it's a revenue-motivated speed trap, which i agree is dirty pool, or you've been pulled over for being a numpty for other reasons .. most cops generally will ignore a certain percentile over the posted speed limits in Ontario. The same can't be said in many US states, where the speed limits are much more zealously enforced. Ever been pulled over for 4 mph over the posted 55 mph? I have .. can't say that i've really had a similar experience here in Ontario.
No real comment on this other than lights are supposed to be more or less properly synchronized to allow for reasonable traffic flow continuity at or near the traffic speed limitations. If you are jack-rabbiting to 65-70 in a 50 zone.. you are going to bump up against a red light more times, than not. Would you rather have speed bumps, instead? Also, European/British style roundabouts are a relatively recent experiment here, and they do appear to work to both control overall speed, and allow traffic to re-route as is necessary - but it takes time and money, to re-design roadways.
Traffic congestion because of a high population density in a relatively small geographic area, creates driver frustration. No other cure for that other than to build more roads, and spend money. Aren't the taxes that you pay, high enough already?
Fight... For your Right.. to Speed!
Pure comedy gold.