Damn, I had a feeling you were from the GTA when you said your ambient temps were 8c haha. I live in North York and most of my traffic is going downtown. I do go up to Markham occasionally, though it's out of my way, I used to live there.
407 is the tolled highway I mentioned having my best chances at, just haven't had the time to yet. There's more popo than I'd like to run into on the 407 recently, so I think I'll try my luck past midnight one of these days.
I live in Markham and work in Thornhill. When I'm late for work, the 407 is far too easy (I live 5 minutes off the 9th line exit). I used to commute the 407 to Jane, so I got used to where the popo hid.
Just fire up Waze. Pretty good in tagging their hiding spots.