Having one category of residential is half the problem.
Look at Mt Royal where they put 40km everywhere, including on the main road (14th St, Elbow Dr). That is too low for main residential roads, but if people go 40 down the "standard" residential roads (ie parking on both sides, not really enough room for 2 full lanes of driving, I'd say they're being reckless.
But at the end of the day, both 14th ST, Elbow and the side residential roads have houses on them, so we treat them the same. Could you imagine Elbow Dr @ 30 the whole way? Bad enough with the "playground" zone that goes 200 blocks
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