Adam Behrman, KBOI News meteorologist, says two-tenths of inch of freezing rain covered the road. Many motorists woke up to vehicles caked with ice. (Is this Ice Storm 2013? >>>)
The conditions led officials to close Interstate-84 from the Broadway exit to Glenns Ferry for several hours. Both lanes are now open. Westbound lanes east of Mountain Home from milepost 95 to 137 are still blocked, however.
"The roadway is extremely icy," Idaho State Police said about the conditions earlier Thursday. "Motorists are advised to slow down, increase your stopping distance, and give yourself extra of time to get to your destination."
Reed Hollinshead, Idaho Transportation Department spokesman, said he's never seen anything like this before.
"This stretch of I-84 that (was) closed from Broadway back to Glenns Ferry - I haven't seen in my recollection (a closure) that involves that many miles," Hollinshead said.
ITD has numerous crews treating the roadways.
The Ada County Sheriff's Office says there have been four crashes with injuries, 37 non-injury crashes, and 32 slide-offs or stalled vehicle reports.