They can already handle the streetcars in SF which sometimes let people out in weird places, although I don't know if it's the same as Toronto. It seems like it would be easy to update them to stop for the open doors if that's what they're supposed to do. They're pretty good at detecting when people might cross in front of them even if there's nobody in their way yet.

FWIW I've never been to Toronto but legally I could go there and drive without knowing about this particular rule. If it's something unique to the area and has the potential for danger I'd be more worried about people than robots.