SALT LAKE COUNTY, Utah — A semi-truck and trailer full of cattle rolled on a Parleys Canyon on-ramp Tuesday evening. Utah Highway Patrol said the semitrailer overturned on the on-ramp from East Canyon to westbound I-80. The driver was uninjured, but it's not yet known whether any cows were killed or injured. As of 6:45 p.m., emergency crews appeared to be working to open the trailer and access the livestock.