Back when I was teaching high school, I biked (on an analog bike) almost every day for several years. I doubt if I missed 5 days in a typical school year. My commute was short, maybe only a couple of miles or so, but with a steep climb at each end; but sometimes I needed to bike into town after school, which added up to maybe 10 miles total for the day. So I was out there rain or shine (this is a rainy town) and simply got used to crappy weather. One cold morning, I paused to shift down and start my climb on the last stretch, and suddenly was on the pavement. Black ice. Tore the knee in a new pair of pants. Had to walk the bike up the hill, which is when I discovered that concrete (the sidewalk) is much less slippery than asphalt (the street).