Cool, -4C/25F, dark commute at 6:30 this morning. Icy roads as a result of snow, then milder conditions to melt it, then colder conditions to freeze the slush. The frozen slush was not deep so although I have studded tires, the studs are more central to the tire whereas more studs that are also located more to the outside of the tread would help me if I had to "climb" out of a rut: the ruts were easily avoided or not that deep. Slightly milder but snowier commute home this afternoon.