Agree with all the points being made. It's unfortunate that Calgary Transit is such a strong opponent of any street safety or traffic calming measures that may require busses to slow down.
As another example, here's an excerpt from the 2020 report on potential speed limit reductions, and the expected operation cost impact provided by CT. The details on these calculations are not publicly available but I have a hunch that it was an overly simplified calculation that doesn't account for the reality that in urban environments, busses rarely have the chance to get up to 50 km/h due to bus stops, stop signs/lights, traffic congestion etc.
These operating cost estimates weighted the cost-benefit results in favour of options that affected transit routes the least, like the 50 collector/40 residential option that ended up being recommended to council.
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