(KSL News) Fog and slick conditions caused problems for air travelers and the morning commute.
Black ice on the road contributed to a wreck this morning on California Avenue in Salt Lake City. KSL Newsradio reports that a car slid into the back of a semi truck, then two other cars crashed into that.
Authorities say the road was extremely slick, perhaps due to cloud seeding. If motorists were going the speed limit in that area, they were driving too fast.
At Salt Lake International Airport, fog was a problem for weekend travelers.
Skywest and America West posted cancellations last night due to poor visibility from the fog. More than 100 people spent the night Saturday inside airport terminals. Airport personnel provided them with cots and airlines threw down pillows and blankets.
Linda Kidd/Back from Vacation: "They're flying those smaller jets and they won't take off. I don't know if we can hang in here. I don't know what we'll do. My mom's with us, too. So that's pretty interesting. She's not having any fun."
Flights are moving again this morning, but some lines are long at the airport. Airlines recommend checking your flight by phone or on the Internet ahead of time.
A valley inversion -- which traps cold air near the ground and creates condensation -- is the main source of the fog.
(The Associated Press contributed to this report.)