The North Texas Tollway Authority began plowing toll roads with convoys Thursday night, using motor graders and truck-mounted plows to move snow and slush to the shoulder and applying deicer. That work will continue throughout Friday as staff work 12-hour shifts.

The National Weather Service said a tenth of an inch of ice could accumulate on raised surfaces, such as bridges, and some areas could get up to a quarter inch. But the main travel impacts are expected to be from sleet and snow.

Black ice is a thin layer that forms on surfaces such as roads, sidewalks and driveways when temperatures are 30 degrees or lower.

The winter weather advisory for North Texas expired Friday afternoon after wintry precipitation moved out of the region.

The first winter storm of the season has left North Texas, but cold temperatures have frozen the water and slush that remained on the ground. TxDOT and cities have been working to clear ice from the roads, but there are still dangerous road conditions.

This week's North Texas snow event will end with a few flurries during Friday's morning commute, leading to hazardous road conditions.

Wintry weather conditions are expected to clear out Friday afternoon after snow, freezing rain and sleet disrupted life for many in North Texas on Thursday. Several North Texas counties, including Collin,