TUCSON, Ariz. — "We actually have...three crews that are specially designed trucks, that actually spray the bridges," Sam Credo, said
Credo is with Tucson's Department of Transportation.
You may see those crews, and their magnesium chloride spray, at bridges around Tucson this weekend.
"Magnesium chloride is a product that actually lowers the temperature of water, the freezing temperature of water to ensure that ice does not form on the bridges."
Credo said there's a golden hour to spray the bridges ahead of a freeze.
"We do that, typically in the middle of the afternoon prior to an evening that we believe we're going to experience freezing temperatures."
Once the chemical is settled on a bridge the countdown begins before bridges need another dousing.
"The magnesium chloride lasts about 10 days, without rain and so that's the way that we ensure that ice does not form on the bridge and keep our roads safe," Credo said.
"There's about 60 bridges throughout the city, and our three crews will actually hit all 60 bridges."
Credo said crews plan to spray those bridges on Saturday.
If you plan to head east on U-10 toward Cochise County you might find different conditions at a higher elevation, as the winter storm rolls through region.
Cochise County Sheriff's Office tells KGUN9 snow plows are on alert for instant response.
No road closures have been reported yet and they advise all drivers to stay well under even posted speed limits.