This was very cool to watch. The jeep looked clean and wet -- no snow to be seen anywhere. But it was dripping, and trailing it was a cloud of snowflakes and ice crystals, some quite large. I watched for four blocks as the effect slowly dissipated, and the whole time I was trying to figure out why I'd never seen anything like it before. The answer is simple: water temperature must be perfect, and air temperature must be perfect. Otherwise the water freezes on the vehicle (I've seen THAT before) or drips off and freezes a few moments later on the road (I suppose I've seen that, too.)
Sometimes you have to stop and smell the flowers. In the winter you have to give pause for other stuff, because there aren't any flowers yet.