Freezing rain is the storm that empties a parking lot of nerve — it lands soft and turns Naperville to glass by six. Chicago Snow & Ice Control Company works that hour, plowing the lots along the Route 59 corridor and salting the entrances and the sloped stretches of aisle where feet go out from under people. Commuters here leave before daylight, and the aim is simple: a lot they can cross while thinking about the train instead of the ground. Between storms the pretreat goes down so the next inch never quite bonds to the pavement. It is unglamorous, exacting work, and the proof of it is a whole February with nothing to report.