BOISE -- Westbound Interstate 84 was blocked for several hours after an overnight collision.

The wreck happened at about 2 a.m. Thursday near milepost 66, between Blacks Creek and the Boise Stage Stop.

Idaho State Police say 68-year-old Rebecca Gibson of Idaho City was driving west in a commercial vehicle hauling three UPS trailers when she drove off the right shoulder. Gibson overcorrected, and the back two trailers overturned in the road.

Emmanuel Gomez, 29, of Kennewick, Washington was driving west in another semi truck behind Gibson, and had to swerve into the median to avoid hitting the tipped trailers.

Robert Fudge, 68, of Apache Junction, Arizona, was also driving westbound in a semi, and crashed into Gilbson's third trailer.

All three drivers were wearing seatbelts, police say, and were not hurt.

The crash blocked the westbound interstate for nearly six hours. All lanes have since been reopened.