With all the turns you would need to service the docklands, an LRT will be slow as hell. you can route the BRT to one of a half dozen location besides Union for passengers to access Union quickly. I think putting a stop to access the Bay street teamway would work well as a BRT stop. Just this and we save 3 billion
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There is one thing the TTC does better than almost every other transit system and that's Buses, we should aim to improve their Bus netowrk.