Pretty good commute at 15F (2F windchill) and partly cloudy with winds from the W @ 12mph. It was probably one of the slowest commutes in at 13.4mph. As I was getting ready to leave, my sister was coming home from work. I was wearing my sweater and she asked me where my coat was because it was cold out. Needless to say, the sweater was perfect for the weather. Once I got to Berkshire Ave, it seemed a lot of cars were almost waiting to the last minute to move to the next lane. Usually they switch lanes about 1/4-1/2 mile behind me. I later found out that the batteries in my rear blinky were just about dead and the light was barely noticable.