Slide offs dotted Utah interstates. Chrys Morris left her home in Davis County and pulled onto southbound I-15 at 4:00 a-m. "The average speed was about 40 miles-per-hour all the way in and I saw at least 11 cars go off. Where the intersection for 215 brakes off of I-15 coming south-- two cars in front of me hit the guard rail," Morris said.
The next round of slide offs is forecast Dec., 26 around 10:00 p.m.
The one two punch of snow and cold weather should be the right combination to form black ice thin enough to be almost undetectable with the naked eye.
"I think the most important thing if you're a good driver is to look out for bad drivers so I give a lot more room and I try to knock my speed down," said Steve Bethers.
"We have to pay lots of attention and drive slowly because one never knows when we're going to see black ice," said Orlando Delallana.
The black ice threat increases around 10:00 p.m. Dec., 26 because the temperatures are forecast to plummet into the mid 20's.