Ontario Highway Traffic Act

Hi everyone

I am a fairly new driver and I hope to get some insight here.

I was in the VERY left lane in a 3 lane street.
I heard the sirens of an ambulance, but did not see it, I began to slow down, to about 30/40 km/h (this was a 60 zone).
When the cars around me began to slow down as well, to my right both lanes were blocked with cars.
I ...