Erick Interstate 40 Business (
I-40 Bus.) in
Erick is a business loop of
I-40 that is the first business route of I-40 in Oklahoma. It begins at exit 5 (Honeyfarm Drive) and runs south onto North 1720th Road until that street ends at a four-lane divided highway known as East 1240th Road (former
US-66), where it turns east. The next intersection is
State Highway 30 (SH-30), which overlaps I-40 Bus. from that point on. I-40 Bus./SH-30 ends as a divided highway at Williams Street and becomes
Roger Miller Boulevard as it enters downtown Erick. The overlap with SH-30 ends at Sheb Wooley Avenue when SH-30 itself turns north. I-40 Bus. becomes a divided highway again east of North 1750th Road and continues east until the intersection with a dirt road named North 1770th Road, where it curves to the northeast. I-40 Bus. finally ends at a folded diamond interchange with I-40, known as exit 11.
Sayre Interstate 40 Business (
I-40 Bus.) in
Sayre is a business loop of
I-40 that is the second business route of I-40 in Oklahoma. It runs north from exit 20, overlapping much of
US-283 as a four-lane divided highway until the intersection with Greer Avenue, where it becomes a four-lane undivided highway. The sole major intersection downtown is West and East Main Streets, which are part of
SH-152. Between Maple and Poplar avenues, I-40 Bus./US-283/former
US-66 has a grade crossing with a former
Rock Island Railroad line, just west of a
historic depot. Further north, it passes by the First Baptist Church, as well as the Route 66 Farmer's Market. I-40 Bus. and historic US-66 leave that overlap across from the intersection with West Sayre Avenue. From there, it runs east-northeast until it reaches a diamond interchange with I-40 at exit 25. Beyond exit 25, the road continues as a jughandle frontage road, leading to East 1170th Road.
Elk City Interstate 40 Business (
I-40 Bus.) in
Elk City is a business loop of
I-40 that is the third business route of I-40 in Oklahoma. It runs northeast along former
US-66 from eastbound exit 32 and turns east after the beginning of an overlap with
SH-6 that runs along the route until SH-6 turns south at North Main Street. From there, it snakes through the northeastern part of the city and, after the intersection with
SH-34, finally terminates with I-40 at westbound exit 41. ;Route description The route begins at a left exit in a Y-interchange with I-40, which also serves as a connection to southbound SH-34. The first intersection along this route is BK 29, which leads to SH-34 and was the west end of an overlap with SH-34 until 1987. The road continues to run northeast, then, after encountering an intersection with
SH-6, which joins I-40 Bus. in a concurrency, it turns straight east. Just after James Way, the divided highway is replaced by a four-lane undivided boulevard with center left turn provisions, and the road approaches the
National Route 66 Museum. As the road approaches downtown Elk City, SH-6 turns south at the intersection with North Main Street. Crossing a bridge over a tributary to Elk Creek, I-40 Bus. makes a sharp curve to the left and heads north at 3rd Street. Between BK 35 and Country Club Drive, the road not only turns to the east again, but also resumes its previous status as a divided highway. Here, it also passes by the
Elk City Regional Business Airport. The approach to the intersection with SH-34 is a sign of the beginning of the end for I-40 Bus. because south of this intersection is an approach to a westbound on/eastbound off Y-interchange with I-40. Immediately after this intersection, I-40 Bus. ends at an eastbound on/westbound off Y-interchange with I-40. ;Junction list
Clinton Interstate 40 Business (
I-40 Bus.) in
Clinton is a business loop of
I-40 that is the fourth business route of I-40 in Oklahoma, running from exit 65 to exit 69, although only part of the route runs along former US-66. ;Route description The route begins at exit 65, which is an eastbound flyover with no reentry, and a westbound right-in/right-out configuration. It runs northeast along West Gary Boulevard, a four-lane divided highway with a grassy median, surrounded by commercial development, including Clinton High School, then the
Oklahoma Route 66 Museum just south of the eastern terminus of
SH-73, and, ironically, west of the original US-66. The divider becomes less prominent north of that intersection, briefly becoming nonexistent in some areas. The road runs parallel to a
Burlington Northern and Santa Fe Railway line until it curves east before the intersection with North 15th Street and continues to run straight east throughout much of downtown. I-40 Bus. does not overlap any former segments of US-66 until 10th Street. With some exceptions, I-40 Bus. continues as a standard commercial strip. Those exceptions consist of historic looking buildings, such as the First Presbyterian Church on the southwest corner of North 7th Street and the former fire station on the northeast corner of North 6th Street. City Hall can be found on the northwest intersection with
US-183 (North 4th Street), as well as a second leg of former US-66. East of that intersection, the surroundings are slightly more industrial. At North 1st Street, the route crosses an abandoned railroad line that was paved in that street as the name is briefly changed to Choctaw Avenue, then crosses a nonabandoned former
Kansas City, Mexico and Orient railroad line now run by the Farmrail and Grainbelt Railroads. Immediately after the intersection with South Glenn Smith Street, the road runs along the bridge over the
Washita River, and the name is reverted to Gary Boulevard, where it becomes more rural. Curving around a former
Rock Island Railroad line, the road becomes a divided highway with a wide grassy divider again, just before the entrance to the Clinton Indian Health Center, the headquarters of the Cheyenne and Arapaho Tribal Government and a branch of the Lucky Star Casino. The last intersection is North 2280th Street before I-40 Bus. ends at a Y-interchange with I-40 at exit 69.
Weatherford Interstate 40 Business (
I-40 Bus.) in
Weatherford is a business loop of
I-40 that is the fifth business route of I-40 in Oklahoma, running from exit 80A to exit 82, along parts of former US-66 and Main Street. ;Route description I-40 Bus. begins at an eastbound-only flyunder interchange and runs northeast along Southwest Main Street and runs beneath a railroad bridge for a former
Chicago, Rock Island and Pacific Railroad line. Southwest Main Street ends at the southwest corner of the intersection of North and South 7th Streets and West Main Street and the route turns east onto West Main Street. West of this intersection, West Main has no designation but connects to
SH-54. West Main Street becomes East Main Street at the intersection with North and South Custer Streets. East of Washington Avenue, I-40 Bus. curves to the northeast then turns right where it ends at another flyunder interchange, while historic US-66 continues onto East Main Street along the north side of I-40. Until sometime in the mid-2010s, this interchange was a trumpet interchange with no east- to westbound ramp.
El Reno Interstate 40 Business (
I-40 Bus.) in
El Reno is a business loop of
I-40 that is the sixth business route of I-40 in Oklahoma, running from exit 119 to exit 125, along former US-66, as well as part of
US-81. ;Route description I-40 Bus. begins at a
trumpet interchange with I-40/
US-270, running northeast as a divided highway until the intersection with East 1020th Drive, thereby joining historic
US-66 and turning straight east along Sunset Road. After passing by the Federal Correctional Institution of El Reno, the divided road narrows as it enters more developed surroundings. Sunset Road curves to the southeast from Foreman Road and passes through Adams Park, only to curve back straight east before a bridge over the Four Mile Creek Riverbed and the intersection with South Country Club Road. Between South Ellison Avenue and North Miles Avenue, I-40 Bus. runs beneath a railroad bridge for an old
Chicago, Rock Island and Pacific Railroad line that runs northwest to southeast and is now owned by
Union Pacific Railroad. Four blocks later, I-40 Bus. intersects US-81 (
Chisholm Trail) at South Choctaw Avenue and joins the route in a southbound concurrency. For one block, I-40 Bus./US-81/historic US-66 run south to Wade Street, then the three routes run east for two blocks to Rock Island Avenue, only to turn south again. Rock Island Avenue carries all three routes straight south until the intersection with East Elm Street, where the road shifts to the south-southeast over a railroad bridge for another former
Rock Island Railroad line. After this bridge, the road begins to curve more toward the east as it briefly intersects and takes over the alignment of Southeast 27th Street. I-40 Bus./US-81 avoids a sharp right turn onto South Shepherd Avenue through a long east-to-south turning ramp, but still intersects the western terminus of
SH-66. Almost immediately, I-40 Bus. ends at exit 125 on I-40/US-270, which is an offset diamond interchange with one south-to-east loop ramp, while US-81 continues south toward
Chickasha. ;Junction list
Henryetta Interstate 40 Business (
I-40 Bus.) in
Henryetta is a business loop of
I-40 that is the seventh business route of I-40 in Oklahoma, running from exit 237 to exit 240, along
U.S Highway 62 Business (US-62 Bus.) and
US-75 Bus., as well as part of
US-62 and
US-75. It is the first business route along I-40 in the state that is not a former segment of US-66. ;Route description I-40 Bus. begins at a diamond interchange with Creek Mine Road. Immediately after the westbound off- and onramps for I-40, the business routes all turn from north to east onto Hornbeam Road. Hornbeam Road runs east then curves to the northeast until it finally ends at West Main Street just west of 17th Street, curving smoothly into that street in the process. The routes run along West Main Street through the southern part of the city and eventually intersect the former
SH-124 (10th Street) without a traffic signal. The only indication of that street's current importance are signs directing motorists to the Henryetta Municipal Airport and an RV Park. Traffic signals can instead be found at 6th, 5th, and 4th streets. After crossing the former
Frisco Railroad tracks along with the abandoned
Kansas, Oklahoma and Gulf Railway line, West Main Street becomes East Main Street at Lake Road, where the fourth traffic signal in town can be found. US-62 Bus./US-75 Bus. end at US-62/US-75, but I-40 Bus. turns south along this overlap until finally terminating at a cloverleaf interchange with I-40, which is also the northern terminus of the
Indian Nation Turnpike.
Sallisaw Interstate 40 Business (
I-40 Bus.) in
Sallisaw is a business loop of
I-40 that is the last business route of I-40 in Oklahoma, running from exit 308 (
US-59) to exit 311 (
US-64). ;Route description I-40 Bus. begins at a diamond interchange with I-40 at exit 308 and then turns north along US-59 (South Kerr Boulevard) as it passes under I-40. The road is a commercial strip that runs at a slight north-northwest angle and serves as a four-lane undivided highway with occasional provisions for left-turn lanes. South Kerr Boulevard curves slightly to the north-northeast where it ends at West Cherokee Avenue (US-64), and both I-40 Bus. and US-59 join US-64 along West Cherokee Avenue in a concurrency. The road narrows down to two lanes and runs beneath a
Kansas City Southern Railroad line but emerges from beneath the bridge to enter "downtown" Sallisaw as a two-lane concrete road with parallel parking and run parallel to a former
Missouri Pacific Railroad line, now owned by
Union Pacific Railroad. The former MoPac Depot is now the Stanley Tubbs Memorial Library. US-59 leaves the overlap at North Wheeler Avenue, and I-40 Bus. continues to follow US-64, along East Cherokee Avenue, which become a four-lane undivided highway before Wheeler Avenue. East of North Dogwood Street, I-40 Bus./US-64 curves to the southeast, away from the former MoPac line, and resumes as a standard contemporary commercial strip. Between Jenkins Street and Doris Drive, the road runs along a bridge over Hog Creek. I-40 Bus. ends at a partial cloverleaf interchange with I-40 known as exit 311, while US-64 continues toward the Sallisaw Sports Complex, Muldrow, and Moffett, where it crosses the J. Fred Patton Garrison Avenue Bridge over the
Arkansas River and the Oklahoma–Arkansas state line. ==North Carolina==