Hey @Lew,
Remember in the old days in city where the one thing you kept an eye out for when driving was just cabs?
Well, as someone who still lives in the city and is subjected to the trauma, yes trauma of the 401 almost daily, here's a few thoughts on what to watch out for...
-Any of the following vehicles: Tesla, BMW, Audi, Mercedes Benz, you get the idea. they all think they are immune to road rules and that speed limits are simply suggestion.
-turn signals, forget it!
-road rage... be careful who you give the finger to, they are likely armed
-driving on the right, really right where there is no lane
-tailgating seems to have become an art form many are trying to perfect
I could go on, but those are what I see most.
HH