One thing that people seem to conveniently ignore in the whole subway extension debate is that yes the Yonge line is congested and people have to wait for subway cars...
for 2 hours a day.
Drivers have learned to leave a little early as traffic will be expected. Each morning, every highway into the city is heavily congested:
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Congestion is good, that means the roads are being used fully. If all routes were green all the time it means we have massively overbuilt our infrastructure.
Our transit should be busy - it's actually a good thing. York should be able to have some sway in extending the subway...as long as their pay for it (and some for the DRL as well!).
I mean, most early morning commuters are already busing to Finch station, so extending the subway north may not net many new early riders anyways.
Does Toronto not want residents of Vaughan/Richmond hill coming down mid-day, evenings, and weekends when the subway is less busy to spend spend spend in the city? Of course they should!
I think another good idea could be to charge people boarding at the Richmond Hill stations a higher fare in the morning rush to convince more people to consider GO. Outside of the AM peak it's still normal fare though. However, this could be tricky to implement (Presto?).