Being the idiot that I can be sometimes, I actually started out on my road bike this morning based on the fact that the arterial right outside our neighborhood was completely cleared. I wind up walking my bike out of the neighborhood due to all of the ice. I get about 0.75 miles down the road and go to make a left and realize that this other major road still has significant snow on it. There's no way the backroads I'll eventually be on will be anywhere near clear (and they didn't disappoint). I turned around to head back home, walked back to my house from the neighborhood entrance, swapped my lights over to my snow bike (rigid MTB with studded tires), and rode to work. What do they say about hindsight?