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Ravell Call, Deseret News
Rescue crews work to free the driver of an SUV that crashed into the back of a dump truck Thursday, Oct. 18, 2012, at 5300 S. Commerce Drive, Murray.

MURRAY — A woman was in critical condition Thursday after the SUV she was driving slammed into a bottom-dump semi truck on I-15, wedging it underneath the large vehicle.

Utah Highway Patrol Lt. Steven Winward said the woman's Toyota 4Runner was exiting northbound I-15 at 5300 South about 3:30 p.m. when the crash occurred. 

A UHP trooper who witnessed the accident reported that the SUV was traveling at a high rate of speed, went off the road, over a culvert, crossed eastbound traffic on 5300 South and became wedged underneath the truck, Winward said.

The woman driving the vehicle became pinned in the crash and had to be extricated by emergency crews, Winward said. She was conscious when she was removed from the vehicle and was taken to Intermountain Medical Center. 

Winward said it took more than an hour to reach the driver. Crews had to raise the dump truck and dismantle part of the 4Runner in order to remove her from the vehicle.

Crews also had to focus on cleanup before the road was cleared. Sand from the dump truck spilled during the accident, and wreckage from the 4Runner was scattered around the crash site.

The occupants of the vehicle, the woman's daughter-in-law and two children under the age of 5, were taken to the hospital with minor injuries, Winward said. The children are believed to be the driver's grandchildren. Both were secured in car seats.

"It's fortunate," Winward said. "It helped save their lives."

E-mail: mromero@deseretnews.com Twitter: @McKenzieRomero