Business routes of Interstate 15
Interstate 15 Business may refer to several business routes of the Interstate Highway System that connect Interstate 15 with the central business district of various cities bypassed by I-15. The business route in each community is considered a unique route. In many cases, these routes are a former section of a U.S. Route or state highway.
Interstate business routes in California are assigned by the California Department of Transportation, but are not maintained by Caltrans unless they overlay other routes of the state highway system. Local authorities may request route assignment from the Caltrans Transportation System Information Program, and all requests require approval of the executive committee of the American Association of State Highway and Transportation Officials.
Escondido business loop
Interstate 15 Business provides access to downtown Escondido, as Centre City Parkway. It follows the former routing of U.S. Route 395.I-15 Bus. begins at I-15 exit 28 near the southern city limits of Escondido. It runs parallel to I-15 north through the city. It intersects both the westbound and eastbound portions of County Route S6, which in this area is split into one-way roads. This intersection provides access to the end of the Sprinter hybrid rail service. Shortly thereafter, I-15 Bus. intersects County Route S14, and then interchanges with California State Route 78. The interchange is the last interchange on SR 78 before its freeway status ends, and there are only ramps for a westbound entrance or eastbound exit. Continuing north, I-15 Bus. intersects with El Norte Parkway, a major arterial road, before reconnecting with I-15 at exit 34 near the northern city limits of Escondido. Though the street itself continues northward well on into Temecula as a frontage road for I-15, its designation as I-15 Bus. ends at this interchange.
Major intersections
Lake Elsinore business loop
Interstate 15 Business in Lake Elsinore, California, provides access to downtown Lake Elsinore as Main Street, Graham Avenue, Lakeshore Drive, and Lake Street. It also follows the former routing of SR 71.Major intersections
Norco business loop
Interstate 15 Business in Norco, California, provides access to downtown Norco as Second Street, Hamner Avenue, and Sixth Street. It also follows the former routing of SR 31.Major intersections
Victorville business loop
Interstate 15 Business in Victorville, California, provides access to downtown Victorville as Seventh Street and D Street. It also follows the former routing of US 66 and US 91.Major intersections
Barstow business loop
Interstate 15 Business in Barstow, California, provides access to downtown Barstow as L Street and Main Street. It also follows the former routing of US 66.The northern terminus of I-15 Bus. is Interstate 40 at exit 1, having the distinction of a business loop not ending at its interstate counterpart. The distinction is shared with Interstate 205 Business in the Tracy area in Northern California, where its eastern terminus is with Interstate 5. Unlike I-205 Bus. where it doesn't return to its interstate counterpart, I-15 Bus. does return to I-15, but continues to its northern end at I-40.
Major intersections
Baker business loop
Interstate 15 Business in Baker, California, provides access to downtown Baker as Baker Boulevard, serving the many food outlets and fuel stations for drivers on I-15 between Los Angeles and Las Vegas. It also features the World's Tallest Thermometer, a landmark. The business route follows the former routing of US 91 and US 466.Major intersections
Mesquite business loop
Interstate 15 Business in Mesquite, Nevada, was also designated as State Route 144. It was removed as of December 31, 2005. It covered Mesquite Boulevard and Sandhill Boulevard in Mesquite. The State Route designation was applied to the portion of Mesquite Boulevard from its southern crossing of I-15 to Sandhill Boulevard, then along Sandhill Boulevard to its northern crossing of I-15. The route was long. Route 144, from SR 170 to Hillside Drive, was once US 91, which used to stretch from Sweetgrass, Montana, to Long Beach, California.St. George business loop
Interstate 15 Business in St. George, Utah, is the first business route along I-15 in the state of Utah. It runs from exit 6 north along Utah State Route 18 to SR-34, where it turns east until reaching exit 8.Cedar City business loop
Interstate 15 Business in Cedar City, Utah, is the second business route along I-15 in the state of Utah. It runs from exit 57 north along SR-130, where it runs near Southern Utah University and the Paiute Indian Reservation-Cedar City until reaching exit 62.Parowan business loop
Interstate 15 Business in Parowan, Utah, is the third business route along I-15 in the state of Utah. It runs from exit 75 along SR-143, at first east on 200th Street, then north on South Main Street until SR-143 turns east onto East Center Street. I-15 Bus. then continues north along SR-274 eventually serving as the western terminus of SR-271 near Parowan Airport until finally terminating at exit 78.Beaver business loop
Interstate 15 Business in Beaver, Utah, is the fourth business route along I-15 in the state of Utah. It runs from exits 109 to 112 along SR-160.Fillmore business loop
Interstate 15 Business in Fillmore, Utah, is the fifth business route along I-15 in the state of Utah. It runs from exits 163 to 167 along SR-99.Holden business loop
The former Interstate 15 Business in Holden, Utah, served I-15 in the state of Utah. It ran from exit 174 at SR-64 to US 50 where it terminated at exit 178, the southern terminus of the I-15 / US 50 overlap.Nephi business loop
Interstate 15 Business in the vicinity of Nephi, Utah, is the sixth business route along I-15 in the state of Utah. It runs from exits 222 to 228 along part of SR-28.Payson business loop
Layton business loop
The former Interstate 15 Business in Layton, Utah, served I-15 in the state of Utah. It ran from exit 332 at SR-227 then turned onto to SR-106 where it terminated at exit 378, the southern terminus of the I-15 / US 50 overlap.Brigham City business loop
Interstate 15 Business is a business loop of I-15 in Brigham City, Utah, and is also concurrent with I-84 Bus. It runs from an interchange at exit 362 on I-15/I-84 at first along US 91 to the intersection with US 89 and SR-13. US 91 continues east along US 89, while I-15 Bus. / I-84 Bus. turn left to go north along SR-13. Further in town, the road serves as the west end of SR-90. At Forest Street, South Main Street becomes North Main Street. North of there, SR-13 / I-15 Bus. / I-84 Bus. curves to the left onto Promontory Road, while North Main Street's designation is replaced by SR-38. From there, the routes run beneath a bridge for North 500th Street West and then another bridge for a Union Pacific Railroad line, eventually ending at a folded-diamond interchange with I-15/I-84 at exit 365, while SR-13 continues to run northwest through Corinne and points further north.Tremonton business loop
Interstate 15 Business is a eastern business loop off of I-15 that passes through Elwood and Tremonton, Utah, and runs mostly along State Route 13 and State Route 102. It is the last business route on I-15 in the state and is largely concurrent with I-84 Bus.I-15 Bus. begins at exit 376 on I-15 / Interstate 84 in Elwood and proceeds north along SR-13 to leave Elwood and, about later, enter Tremonton. Well beyond the developed areas of Tremonton, the three routes reach an intersection with Utah State Route 102 at Haws Corner Junction. At that intersection I-15 Bus. and I-84 Bus. both turn west onto SR-102. The three routes continue west on West Main Street to connect with the southern end of Utah State Route 82. Upon crossing Tremonton Street, the three routes transition from West Main Street to East Main Street. At 1000 West, I-15 Bus. turns north and leaves its concurrency with I-84 Bus. and SR-102. Proceeding north along North 1000 West I-15 Bus. reaches West 1000 North. Shortly after turning west onto that street, I-15 Bus. reaches its northern terminus at I-15.