SALT LAKE CITY — Drivers are being urged to slow down and use caution after a storm system that moved into Northern Utah overnight led to a slippery commute along parts of the Wasatch Front Thursday morning. Several crashes, including three rollovers, happened on I-80 between Saltair and 5600 West in western Salt Lake County, the KSL Traffic Center reported. At least six crashes were reported along I-15 in the Salt Lake Valley and several more near American Fork. Icy conditions on I-215 caused multiple cars to spin out in Taylorsville near 4700 South at about 7 a.m., causing north and southbound lane closures and traffic delays in the area.