Snow and ice and snow are accumulating on bridges and overpasses of major highways, according to TxDOT. Motorists should drive with caution and expect traffic delays.

After several days of freezing temperatures, snow, sleet and rain fell in North Texas Thursday, bringing travel disruptions in the air and on the ground, school closures and upending a region that doesn’t often see frozen precipitation.

The anticipated wintry mix will move into the metroplex overnight from the west, around the 4-6 a.m. time period, spreading across the I-35 corridor in the 6-9 a.m. period, and into the eastern counties after that.