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(KSL News) -- An accident this morning on I- 15 snarled traffic near Lehi.
Witnesses say a semi- truck headed south on I-15 near Lehi, drifted into the right lane of traffic. It clipped a dump truck, causing the dump truck driver to lose control.
![Dump Truck Rolls on Lehi I-15 On-ramp](https://img.ksl.com/slc/0/83/8391.jpg?filter=kslv2/inline_lg)
Officers say the dump truck swerved and rolled off the road and stopped on the Lehi on-ramp.
The driver, who was not wearing a seatbelt, was thrown from the dump truck. She's now in critical condition.
The southbound onramp in Lehi and the right lane of traffic are closed while crews clean up.