Polar vortex effect: 40 vehicles collide one after another

Emergency crews work at the scene of a massive pileup involving more than 40 vehicles, many of them semitrailers, along Interstate 94 Thursday afternoon, Jan. (AP Photo)

At least three were killed and more than 20 people were injured. (AP Photo)

Vehicles are damaged after a pileup involving a logging truck and more than 40 other vehicles in Meridian(AP Photo)

Idaho State Police spokeswoman Teresa Baker said the crash happened as emergency responders tried to clear a previous wreck on Interstate 84, one of the state's main east west highways. (AP Photo)

She said a motorist in a black Subaru tried to move to the right lane and away from the previous crash but clipped a silver Subaru. (AP Photo)

A logging truck then hit the black car, causing a chain reaction crash in the interstate's westbound lanes that included four other tractor trailers. Baker said 10 people have been transported by ambulance to area hospitals, including the driver of the black Subaru. The man sustained serious injuries, but they aren't considered lift threatening, Baker said. (AP Photo)