23F & clear 6AM: due to the cold temp & reports of ice, I overdressed with wool sweater, down jacket, insulated booties & a wool cap under my helmet, then I got pretty damp under all that during my short 4 mile commute. Rode my mountain bike & despite the frost & ice, didn't experience any slip or slide situations. This bike is really slow compared to my road bikes but it sure handles slippery conditions. The few cars I encountered were driving very slow & carefully. We all got along today! Don