We had a terrible cold snap this winter. Got down to mid to high 20s one night. No moisture though, and I don't even remember the bridges being sanded this winter. You can tell when they did quite easily...there's usually guardrail damage on both ends of many bridges and ruts through the medians every 1-2 miles. That's another reaaaallllly good reason to stay home until it melts...no one here knows how to drive in it on the rare occasion that it does happen.