Interstate 15 (I-15) is a major Interstate Highway in the Western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The Interstate serves the cities of San Diego, San Bernardino, Las Vegas, Salt Lake City, Idaho Falls, and Great Falls. It also passes close to the urban areas of Los Angeles, Orange, and Riverside counties, California. The stretches of I-15 in Idaho, Utah, and Arizona have been designated as the "Veterans Memorial Highway". The southern end is at a junction with I-8 and State Route 15 (SR 15) in San Diego, and the northern end is at a connection with Alberta Highway 4 at the Sweetgrass–Coutts Border Crossing.
U.S. Route 491 (US 491) is a north–south U.S. Highway serving the Four Corners region of the United States. It was created in 2003 as a renumbering of U.S. Route 666 (US 666). With the US 666 designation, the road was nicknamed the "Devil's Highway" because of the significance of the number 666 to many Christian denominations as the Number of the Beast. This Satanic connotation, combined with a high fatality rate along the New Mexico portion, convinced some people the highway was cursed. The problem was compounded by persistent sign theft. These factors led to two efforts to renumber the highway, first by officials in Arizona, then by those in New Mexico. There have been safety improvement projects in recent years, and fatality rates have subsequently decreased.
U.S. Route 91 or U.S. Highway 91 is a 172.7-mile-long (277.9 km) north–south United States highway running from Brigham City, Utah, to Idaho Falls, Idaho, in the U.S. states of Idaho and Utah. Despite the "1" as the last digit in the number, US 91 is no longer a cross-country artery, as it has mostly been replaced by Interstate 15. The highway currently serves to connect the communities of the Cache Valley to I-15 and beyond. Prior to the mid-1970s, US 91 was an international commerce route from Long Beach, California, to the Canada–US border north of Sweetgrass, Montana. US 91 was routed on the main streets of most of the communities it served, including Las Vegas Boulevard in Las Vegas and State Street in Salt Lake City. From Los Angeles to Salt Lake, the route was built along the corridor of the Arrowhead Trail. A portion of the highway's former route in California is currently State Route 91.
Interstate 84 (I-84) is an Interstate Highway in the northwestern United States. The highway runs from Portland, Oregon, to a junction with I-80 near Echo, Utah. The highway serves and connects Portland, Boise, and Ogden, Utah. With connections to other highways, I-84 connects these cities to points east and also serves as part of a corridor between Seattle and Salt Lake City. The sections running through Oregon and Idaho are also known as the Vietnam Veterans Memorial Highway.
State Route 198 is a highway completely within Utah County in northern Utah that connects Santaquin to Spanish Fork via Payson and Salem. The route runs 16 miles (26 km). The entire length of the route is an old routing of US-6 and US-50; a portion of the route was also US-91. These routes were re-aligned or truncated after the Interstate Highway System was constructed through this part of Utah.
State Route 106 (SR-106) is a state highway in the U.S. state of Utah, running northerly from Bountiful to Farmington. Most of the road is the old route of US-89/US-91, and once extended further along that old alignment in each direction.
Interstate 84 (I-84) is a part of the Interstate Highway System that links Portland, Oregon, to I-80 near Echo, Utah. The 117.38-mile-long (188.90 km) segment in the US state of Utah is the shortest of any of the three states the western I-84 passes through and contains the eastern terminus of the highway. I-84 enters Box Elder County near Snowville before becoming concurrent with I-15 in Tremonton. The concurrent highways travel south through Brigham City and Ogden and separate near Ogden-Hinckley Airport. Turing east along the Davis County border, I-84 intersects US Route 89 (US-89) and enters Weber Canyon as well as Morgan County. While in Morgan County, I-84 passes the Devil's Gate-Weber Hydroelectric Power Plant and Devil's Slide rock formation. Past Morgan, the highway crosses into Summit County, past the Thousand Mile Tree before reaching its eastern terminus at I-80 near Echo.
State Route 13 (SR-13) is a state highway in northern Utah, running 32.841 miles (52.852 km) parallel to I-15 in Box Elder County from Brigham City to Riverside. Most of SR-13 is a former routing of U.S. Route 191.
State Route 90 (SR-90) is a state highway in the U.S. state of Utah that sits completely within Brigham City in Box Elder County. The route travels from its western terminus at SR-13 to its eastern terminus at the junction of US-89/US-91.
State Route 26 (SR-26) is a state highway in northern Utah running for 3.724 miles (5.993 km) in Weber County from Roy to Ogden. It serves as a diagonal route through the Ogden suburbs and the primary connector from northbound I-15 to eastbound I-84 and westbound I-84 to southbound I-15.
U.S. Route 89 in the U.S. state of Utah is a north-south United States Highway spanning more than 502 miles (807.891 km) through the central part of the state, making it the longest road in Utah. Between Provo and Brigham City, US-89 serves as a local road, paralleling Interstate 15, but the portions from Arizona north to Provo and Brigham City northeast to Wyoming serve separate corridors. The former provides access to several national parks and Arizona, and the latter connects I-15 with Logan, the state's only Metropolitan Statistical Area not on the Interstate.
State Route 30 (SR-30) is a state highway in the U.S. state of Utah. It is the only highway signed as a Utah state route to traverse the entire width of the state. Legislatively the highway exists as 3 separate segments. With implied connections via Interstate 84 and U.S. Route 89, the highway is drivable as a continuous route from Nevada to Wyoming. The western segment is a historic corridor paralleling the pre-Lucin Cutoff routing of the First transcontinental railroad. A portion of the eastern segment has been designated the Bear Lake Scenic Byway as part of the Utah Scenic Byways program. The route was created in 1966 by combining several state highways into a single designation.
State Route 16 (SR-16) is a state highway in northeastern Utah, running for 29.359 miles (47.249 km) in Rich County from the Wyoming state line near Woodruff to Sage Creek Junction. It serves as part of a road from Evanston, Wyoming to Jackson Hole, Wyoming.
State Route 273 (SR-273) is a state highway completely within Davis County in the northern portion of the U.S. state of Utah that connects Farmington and US-89 to Kaysville and I-15.
State Route 193 is an east and west highway located completely in Davis County, Utah, United States that begins at the West Davis Corridor, runs past the south entrance of Hill Air Force Base and ends at US-89.
State Route 37 (SR-37) is a state highway in the U.S. state of Utah, forming a 270° loop through the western part of the Ogden-Clearfield metropolitan area. The route is 12.35 miles (19.88 km).
State Route 108 (SR-108) is a state highway in the U.S. state of Utah that spans 12.920 miles (20.793 km) in Davis and Weber Counties. The road connects I-15 and Layton to Syracuse and Clinton before terminating at SR-126 in Roy. The entire route is within the Ogden-Clearfield metropolitan area.
State Route 60 (SR-60) is a 7.496-mile-long (12.064 km) state highway in the U.S. state of Utah, serving local traffic in the Ogden area. It parallels Interstate 84 (I-84) from SR-26 in Riverdale to U.S. Route 89 (US-89) in South Weber, and was part of the first state highway into Weber Canyon.
State Route 103 (SR-103) is a 0.225-mile-long (362 m) urban minor arterial state highway in the U.S. state of Utah. It branches off from SR-126 in downtown Clearfield and extends east to Interstate 15 (I-15), with the roadway continuing to the Falcon Hill National Aerospace Research Park, just outside Hill Air Force Base. The entire route is located in Davis County and was formed in 1965 coinciding with the construction of I-15.
State Route 82 (SR-82) is a state highway in the U.S. state of Utah. It is a short connector road, only 3.178 miles (5.114 km) long, that connects the towns of Tremonton and Garland in Box Elder County.
I-15 in Layton 
SR-108 in Layton
SR-193 in Clearfield 
SR-39 in Marriott-Slaterville 
I-15 / I-84 in South Willard 
US 89 in South Willard
