Here's a nice little walkthrough for when you should call the cops:

Severe Injury/medical emergency -> No, you should call an ambulance.

Car Crash -> Fire department and ambulance

Mental Health Crisis -> Community healthcare network. 211 in most communities, or find a local community group dedicated to that care

Fender Bender -> Get yourself to a collision centre. They don't give a shit.

Crimes -> You can try the non-emergency line, but they're not gonna show up or even call back. Enjoy being on hold for 3 hours.

Someone who's an active danger to the public -> That is the cop.

There's no reason to call the cops, or for them to exist in the first place.

@mayintoronto Folk call 911 in most of those situations and the operator determines who gets sent.

Often times with health emergencies, fire department and ambulance are deployed, with fire truck responding the quickest. At least in my experience.

I do think the 911 operators need to be better educated with regards to alerting cops, as most folk facing an emergency know 911.

@CStamp There's a massive education campaign in Toronto right now getting people to call 211 for mental health and social supports instead of 911. It's been really nice to see those posters.
@mayintoronto I haven’t been downtown in a while. That is great news. It needs to be put into muscle memory the same way 911 is.