Black ice -- you can't see it ... Over in Sugar Land, city officials are warning drivers that road conditions are worsening as the night goes on.

Since that’s often a black asphalt road, we call it “black ice.” The transparent nature of black ice is because it’s much thinner than other ice, which also makes it more hazardous.

The National Weather Service issued a freezing fog advisory at 7:47 a.m. on Friday valid between 8 a.m. and noon for Grande Ronde Valley.