As a guy who has commuted by bike for the better part of 20 years, I leave my bike in the house and drive in my car when it's snowing or icy for the same reason

As a guy who has commuted by bike for the better part of 20 years, I leave my bike in the house and drive in my car when it's snowing or icy for the same reason that I wouldn't drive a motorcycle. Two wheels in those conditions is just dangerous. Watching the die-hards in Portland slide out and eat pavement on icy roads is humorous every year. While there was a time I relished the adventure, I'm just too old for that kind of risk. I suppose I'd be more comfortable with a 3/4 wheeled bike, but there's still the risk of other car drivers bouncing off you, which they do a lot in Portland in the winter.