A winter weather advisory for the entire area has been extended until Tuesday morning.
Icy roads are likely Monday night and early Tuesday as temperatures fall below freezing, causing melting snow and runoff to refreeze.
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Light snow or freezing drizzle will also be possible.
Road surfaces are still very cold, and even treated roadways could be slick with black ice.
Elevated surfaces such as bridges and overpasses generally freeze before other roads.
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Freezing drizzle may also reduce the effectiveness of ice-melting products on sidewalks, so those also may be icy.
Check on elderly neighbors who may have trouble clearing snow from their sidewalks or driveways.
PennDOT told Channel 11 it's gearing up for a long night ahead, putting 21 trucks out in Allegheny County, and additional trucks in Beaver, Washington and Lawrence counties.
Drivers will be working around the clock to spread salt over the county's 3,600 miles of roadway with the goal of treating main roads before they become icy again.
"Throughout the remainder and throughout early evening, we will continue cleanup operations," said Steve Cowan, spokesperson for PennDOT. "We'll see some plows out hitting some of the shoulder areas, some of the turning lanes and ramps we haven't been able to get to completely overnight. We will be focusing on areas (where) it might refreeze."
Channel 11 also checked in with Public Works in Pittsburgh and were told that it does not anticipate any problems for the morning commute, but that there is a possibility of a refreeze during the night and it too is pre-treating the roads.
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