I was driving to SLC from PC at like 11:00 last night. Roads were just awful, completely snow packed with barely even any ruts. I was coming up on a car going maybe 20 in the middle lane. I move over to the completely snow covered lane on the left and slowly start to pass them. As I'm passing a car comes speeding up and starts tailgating me. Keep in mind that I'm now going probably close to 50 and am actively passing this other car. It's snowing hard and there athe roads are completely covered and this jackass behind me is so close that I can barely see the headlights. They even dipped into the shoulder and I thought they were going to try and pass me there, but swerved back over. As soon as I cleared the very cautious (for good reason) drive I moved back over and they sped by me in their Subaru, of course. I was hoping to see a slide off, but they got off before we started up the summit.