Tuesday's winter wonderland in Southeast Texas is taking on a new, uglier form thanks to an overnight hard freeze rendering roads and walkways treacherously slick.  Snow melt from Winter Storm Enzo, which dropped more than 5 inches of snow in isolated areas around Houston,

Black ice is an invisible cold weather danger, but how does it form and how can you protect yourself when walking and driving?

Black ice is a deadly driving hazard defined as patchy ice on roadways or other transportation surfaces that cannot easily be seen.