Comment 114067

By kevlahan (registered) | Posted October 06, 2015 at 12:52:17

One strange thing about the road classification design guidelines is that even though both "collectors" and "minor arterials" are described as having the same 50-60 km/h posted speed limit, the minor arterials are supposed to be designed for 70 km/h and the collectors for 60 km/h.

Apart from the fact that these design speeds are both significantly greater than the legal speed limit (up to 20 km/h greater), what is the justification for the higher design speed on the minor arterials? Are they actually trying to encourage speeding to increase traffic flow?

And current thinking is that you design urban streets for the actual desired speeds (e.g. using traffic calming features like bump outs, chicanes, narrow lanes, speed humps etc.) rather than designing for speeds 20 km/h over the legal limit!

Comment edited by kevlahan on 2015-10-06 12:55:43

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