Crews from the City of Tucson Department of Transportation (TDOT) Streets and Traffic Maintenance Division are initiating Operation Freeze today. The program makes sure bridge decks are free of ice and safe for motorists to use.
During Operation Freeze, TDOT crews spray magnesium chloride on the bridge decks to lower the freezing temperature of water and prevent ice from bonding on a roadway. The treatment lasts for approximately 10 days. When temperatures warrant, 58 city bridge decks are sprayed and monitored throughout the evening and into the early morning to make sure ice doesn't form at the crossings.