 Major numbering changes were made in Utah 's state highway system in the 1960s and 1970s , beginning with the construction of Interstate Highways and culminating in the 1977 renumbering , where state route numbers concurrent with other types were dropped entirely . However , the majority of these changes were not visible to the public , as signs continued to display US @-@ 89 and other U.S. Routes and Interstates . The following changes were made to state routes related to US @-@ 89 : 
