Utah State Route 268 grade-level at 400 West and continues east for another block before terminating at US-89 (Beck Street). The State Road Commission designated SR-268 in 1960, connecting proposed I-15 to SR-1 (US-89/US-91) along 600 North. Utah State Route 268 State Route 268 is a state highway in the U.S. state of Utah that connects I-15 to US-89 in a span of . The highway is completely within Salt Lake City and is routed along 600 North. The highway begins just west of the interchange with I-15 at 800 West. Immediately following that intersection, a short viaduct begins. After the structure tops out,
Utah State Route 51 of the oldest grade separated interchanges in Utah still in use. Although portions of Interstate 15 were constructed in 1955, the Beck Street interchange (I-15/US-89) is the only original structure from 1955 still in use. Utah State Route 51 State Route 51 is a short highway completely within Utah County in northern Utah that connects SR-147 to US-89. The highway runs for three miles (5 km) and is an old routing of U.S. Route 91. The route begins at the intersection of 400 North (SR-147) and Childs Road in Spanish Fork, SR-51 heading northeast as a two-lane undivided highway on