Blackice was easy -

Back in my trucking days I got stuck in a hideous ice storm up in Dallas, trying to deliver toys to a WalMart distribution center north of town, then deliver to another south of town. During the course of the day the 'skyways' (the overpasses allowing one to exit from the main highways) were closed due to icing. Good thing really, sliding off a 300' high ramp into interstate traffic in an 80,000lb truck isn't my idea of fun. To get around these closures, traffic was using back routes - small feeder roads that accomplished the same thing as these skyways.

It was on one of these that I first encountered black ice. So clear and dull was the sheen that I couldn't tell it from the pavement in front of me. I'd stopped on it because traffic ahead was backed up...and my truck started sliding towards the 8' ditch to my right.

It was the grace of the good lord above and a bag of sand I kept in my toolbox for emergency traction that saved me and my truck that day. I've been blackice ever since - it was also my CB handle btw.