Speed limits in the United States by jurisdiction 2013) to place more zones on rural parts of I-15, I-80 and I-84. The areas under consideration, UDOT spokesman said, are on I-80 from Grantsville (exit 99) to Wendover, on the Utah-Nevada border; I-84 from Tremonton to the Utah-Idaho border; I-15 from Brigham City (North interchange) to the Utah-Idaho border; and I-15 from Santaquin to North Leeds." The speed limit on these sections has been increased from 80 mph as of September 17, 2013. On February 13, 2014, UDOT voted to increase the speed limit on I-80 from Salt Lake City across the Bonneville Salt Flats to the Nevada border
Salt Lake County, Utah Salt Lake County, Utah Salt Lake County is a county located in the U.S. state of Utah. As of the 2010 census, the population was 1,029,655, making it the most populous county in Utah. Its county seat and largest city is Salt Lake City, the state capital. The county was created in 1850. Salt Lake County occupies the Salt Lake Valley, as well as parts of the surrounding mountains, the Oquirrh Mountains to the west and the Wasatch Range to the east (essentially the entire Jordan River watershed north of the Traverse Mountains). In addition, the northwestern section of the