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.

Thursday brought snow to parts of North Texas and the Panhandle. Here are the totals, and when Texans can expect road conditions to improve.

Nearly half of Thursday’s flights in and out of DFW are canceled Thursday, though crews are treating roads and runways.