While here in Montreal (for the 1st time), I noticed that sometimes green traffic lights will not just light up green but will blink green.  I have never seen this in all my world travels.  I asked a local and was told it means that you can either go straight through the light and you can safely turn left at that light without worrying whether oncoming traffic also has a green light.  In the US, we usually have a green arrow that is separate from the standard green light.

Oh and a quick tip if you want to avoid traffic tickets in Montreal, don’t turn right at any red light.  This is illegal in the entire city and will get you a ticket lickety split.  No right on any red lights…wait for a green light.  My good deed for the day is complete :)