PAYSON — Six people were injured in a seven-car accident Monday that turned I-15 into a parking lot for holiday travelers trying to return home.

About 5:15 p.m., traffic on northbound I-15 near 800 South in Payson had come to a stop through a construction zone. A pair of vehicles came up on the stopped traffic too quickly and smashed into the back of a car, causing a domino effect, the Utah Highway Patrol reported.

Three people were transported to area hospitals in critical conditions, one in serious and two with minor injuries, according to the UHP.

Northbound traffic through Payson was shut down for more than an hour.

At least four people were killed on Utah's roads over the holiday weekend.