Business routes of Interstate 80 exist in four states; California, Nevada, Utah, and Wyoming.
Sacramento, California business loop
Interstate 80 Business, called the Capital City Freeway in its entirety, is a Business Loop of Interstate 80 through Sacramento. As it is state-maintained, unlike most business routes in California, it is assigned route numbers - part of U.S. Route 50 on its western half (5.64 miles/9.08 km), and unsigned State Route 51 on its eastern half (8.86 miles/14.26 km). The full road is a freeway, and carried Interstate 80 until 1981, when the signage and designation of Interstate 80 was transferred to the Beltline Freeway, previously signed as Interstate 880. At that time, the American Association of State Highway and Transportation Officials (AASHTO) assigned the Interstate 305 designation to the west half, which met Interstate Highway standards. However, the California Department of Transportation (Caltrans) has never signed this number, put it on any road signs, or used it internally. (Note: The Federal Highway Administration lists unsigned I-305 as 8.44 miles (13.58 km), increased from 5.3 miles (8.5 km) in 1999.
Truckee, California business loop
Interstate 80 Business is a business loop in the U.S. state of California. It serves as a loop around Truckee, California near Interstate 80, and traverses through Donner Pass Road.
West Wendover, Nevada–Wendover, Utah
Interstate 80 Business (BL-80) is an unofficial business loop of Interstate 80 (I-80) that is 2.26 miles (3.64 km) long and serves as the main street for the US cities of West Wendover, Nevada, and Wendover, Utah, along a roadway named Wendover Boulevard. Wendover Boulevard was originally part of U.S. Route 40 (US 40), which connected California to New Jersey via Nevada and Utah. A portion of the Nevada segment is concurrent with U.S. Route 93 Alternate (US 93 Alt.), and the entire portion in Utah is coterminous with Utah State Route 58 (SR-58). The Nevada Department of Transportation (Nevada DOT) applied for the business loop designation in the early 1980s but the designation has never been approved; nevertheless, signs are posted in both states. Between July 1976 and 1993, BL-80 was concurrent with State Route 224 (SR 224) in Nevada.
Interstate 80 Business (Evanston, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that runs 3.150 miles (5.069 km) through Evanston in western Uinta County. The business route is coexistent with US 189 Business for its entire length. I-80 Bus. begins at I-80 Exit 3; the ramp from westbound I-80 to the business route lies east of the other three ramps of the diamond interchange. The business routes heads east along Harrison Drive, which veers northeast onto 11th Street at the western edge of the city street grid. In the downtown area, I-80 Bus. turns southeast onto Front Street. At the intersection of Front Street and Sixth Street, which is the northern terminus of WYO 150 and the southern terminus of WYO 89, the business route turns north and crosses the Union Pacific Railroad's Evanston Subdivision rail line. I-80 Bus. crosses the Bear River, then turns east onto Bear River Drive (Lincoln Highway) while WYO 89 continues north. The business route follows Bear River Drive east until it rejoins I-80 at Exit 6.
Interstate 80 Business (Fort Bridger–Lyman, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that has a length of 15.630 miles (25.154 km) through Fort Bridger and Lyman in eastern Uinta County. The business route begins at I-80 Exit 34 where it heads east across Blacks Fork of the Green River and passes through the unincorporated town of Fort Bridger, which contains the namesake historic fort. I-80 Bus. intersects WYO 414 in the hamlet of Urie then curves north onto the town of Lyman. The business route follows Main Street, then intersects the southern end of WYO 413 within a sharp curve east onto Clark Street. I-80 Bus. leaves the town and curves northeast, then crosses Smiths Fork, a tributary of Blacks Fork, before rejoining I-80 at Exit 48.
Interstate 80 Business (BL-80) is a business loop of Interstate 80 (I-80) within Green River, Wyoming that is also overlapped with U.S. Route 30 Business, and avoids the Green River Tunnel on I-80. The road is named West Flamingo Gorge Way west of North Center Street and East Flamingo Gorge Way east of North Center Street. Signs on I-80 tell motorists that the route leads to Wyoming Highway 530, but the west end of the road is also close to the terminus for Wyoming Highway 374.
Interstate 80 Business (Rock Springs, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that runs 4.120 miles (6.630 km) through Rock Springs in central Sweetwater County. The business route is coexistent with US 30 Bus. for its entire length. I-80 Bus. begins at Exit 102 and heads east along Dewar Drive. The highway curves northeast and passes to the north of downtown Rock Springs. Downtown is served by WYO 430, which I-80 Bus. intersects just east of a rail line that branches north from the Union Pacific Railroad's Rawlins Subdivision. The business route follows Center Street west of WYO 430 and Bridger Avenue to the east, then follows Pilot Butte Avenue through the eastern part of the city to its eastern junction with I-80 at Exit 107.
Interstate 80 Business (Rawlins, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that has a length of 3.770 miles (6.067 km) through Rawlins in western Carbon County. The business route is coexistent with US 30 Bus. for its entire length. I-80 Bus. begins at I-80 Exit 211 on the western edge of the city and heads east concurrently with WYO 789 along Spruce Street. In downtown Rawlins, at the intersection of Spruce Street and Third Street, the business route turns south onto Third Street, WY 789 turns north onto Third Street, and the business route begins to run concurrently with US 287. Three blocks to the south, I-80 Bus. and US 287 turn east onto Cedar Street and parallel the Union Pacific Railroad along its Rawlins rail yard, which serves as the boundary between the Rawlins Subdivision to the west and the Laramie Subdivision to the east. The highway meets the southern end of US 287 Bypass (Higley Boulevard) shortly before reaching its eastern end at I-80 Exit 215. Within the trumpet interchange on the south side of I-80, the interchange ramps meet the western end of WYO 76, which heads east toward Sinclair.
Interstate 80 Business (Laramie, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that spans 6.357 miles (10.231 km) through Laramie in southern Albany County. I-80 Bus. begins at I-80 Exit 310 and heads east along Curtis Street, which crosses over the Laramie River and the Union Pacific Railroad's Laramie Subdivision. The business route turns south onto Third Street, along which the highway runs concurrently with US 30 and US 287. In downtown Laramie, I-80 Bus. and US 30 turn east onto Grand Avenue, which runs along the southern edge of the University of Wyoming campus. The highway curves southeast and leaves the city of Laramie just north of its end at the trumpet interchange of I-80 Exit 316.
Interstate 80 Business (Cheyenne, Wyoming) (BL-80) is a business loop of Interstate 80 (I-80) that runs 6.935 miles (11.161 km) through Cheyenne in central Laramie County. I-80 Bus. begins at I-80 Exit 358, a three-ramp partial cloverleaf interchange next to the Union Pacific Railroad's Laramie Subdivision rail line at the western city limits of Cheyenne. WYO 225 (Otto Road) heads southwest from the interchange and I-80 Bus. and US 30 head east along Lincolnway. The interchange has no ramp to eastbound I-80; that movement is made via the business route's four-ramp partial cloverleaf interchange with I-25 and US 87 a short distance to the east. I-80 Bus. and US 30 intersect Missile Drive, cross Crow Creek, and have an at-grade crossing of a BNSF Railway line before entering downtown Cheyenne. In the center of downtown, north of the Cheyenne rail yard and the Cheyenne Depot Museum, the highways intersect US 85, I-25 Bus., and the northern end of I-180. Those north–south highways use Central Avenue southbound and Warren Avenue northbound. I-80 Bus. and US 30 leave downtown Cheyenne and the vicinity of the railroad as they pass Holiday Park. On the east side of Cheyenne at Lincolnway's intersection with WYO 212 (College Drive), US 30 continues east and I-80 Bus. turns south onto WYO 212. The business route and state highway cross over Union Pacific's Sidney Subdivision on the way to the eastern terminus of I-80 Bus. at I-80 Exit 364 across from the Laramie County Fairgrounds.