TUCSON, Ariz. - City crews are spraying bridges at 2 p.m. Monday to prevent slippage during icy conditions.
Officials initiated Operation Freeze, which calls for crews to place "Wet Road Ahead" signs at bridge entrances and spray magnesium chloride on the bridges.
Workers will spray 60 city bridge decks.
Motorists should expect possible delays at bridge crossings while the crews are working.
Officials say magnesium chloride sprays last 10 days and do not contaminate drinking water or vegetation.
Shelters around the city are bracing for a cold night and they're boosting their capacity to prepare.
At the Salvation Army Hospitality House 40 extra cots are being placed in their men's shelter.
They'll have 10 extra cots for their women's shelter.
Their total capacity now upped to 154 beds which they anticipate will fill up fast.
While the sun was up people lined up for a warm ahead of a cold night.
One woman told us -- she's resorting to desperate measures to stay warm.
"We went back to my camp and sit by the fire and kept warm last night."
We don't know Grace's specific situation, but starting fires in public is illegal in many cases.
Another shelter, the Gospel Rescue Mission, says they'll boost their capacity.
They say they'll be adding 46 more beds to add to their total of 409.