"It's called 'black ice' because it tends to look like the rest of the pavement on the road, although in reality, it's actually clear," the US Forest Service notes. "Black ice forms without creating bubbles, which allows it to blend in with any surface it forms over. Black ice is dangerous precisely because it's hard to detect."

Storm chaser Aaron Jayjack reports roads and highways covered in snow and ice in the aftermath of the historic winter storm in Houston, Texas, on Jan. 22. But warmer weather is coming to thaw the ice.