Business routes of Interstate 40

The business loop of Interstate 40 through Needles in San Bernardino County begins at exit 141 of I-40/ US 95 northwest of town. The unsigned highway follows Broadway Avenue to the southeast to Needles Highway, then eastward through an underpass of I-40 into the town center. At N Street, the loop turns southward into the southern part of town where it reconnects with Broadway Ave. The route then continues southeastward to I-40 exit 144 where it terminates and US 95 continues southward along Broadway. The route largely follows the former route of US 66 through town except where the historic highway's path has since been disrupted by the construction of I-40.[2]

Major intersections

The entire route is in Needles, San Bernardino County.

mi[2]	km	Destinations	Notes
0.0	0.0	I-40 / US 95 – Barstow, Las Vegas, Kingman	Western terminus; I-40 exit 141
3.4	5.5	I-40 / US 95 – Barstow, Kingman, Lake Havasu City, Blythe	Eastern terminus; I-40 exit 144
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

State Business Route 40 (0) (also known as I-40 BL) was a former business loop of I-40 at Kingman in Mohave County. The 3.7-mile (6.0 km) loop began at I-40 exit 48 where US 93 approaches the intersection from the west along Beale Street and joins the Interstate while the loop proceeded eastward along Beale St. After a short distance, the loop joined Andy Devine Avenue which carried the former US 66. The loop turned northward returning to I-40 and US 93 at exit 53 where the loop terminated, but the roadway continues forward carrying SR 66.[3][6]

Major intersections

The entire route was in Kingman, Mohave County.

mi[3]	km	Destinations[7]	Notes
0.00	0.00	I-40 / US 93 (Beale Street) – Los Angeles, Flagstaff, Phoenix, Las Vegas	Western terminus; I-40 exit 48
0.37	0.60	Grandview Avenue/Beale Street/Route 66 To Historic US 66	East end state maintenance; I-40 BL was maintained by city of Kingman between mile 0.37 and 3.56
		Historic US 66 west (Andy Divine Avenue) – Oatman	Western end of concurrency with Historic US 66
3.56	5.73	Historic US 66 west (Andy Divine Avenue) / Michael Street	West end state maintenance; I-40 BL was maintained by city of Kingman between mile 0.37 and 3.56
3.73	6.00	I-40 / US 93 / SR 66 (Andy Devine Avenue) / Historic US 66 east – Los Angeles, Las Vegas, Flagstaff, Phoenix, Peach Springs	Eastern terminus; eastern end of concurrency with Historic US 66; I-40 exit 53
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

State Business Route 40 (1) (also known as I-40 BL) is a business loop of I-40 at Seligman in Yavapai County. The 4​¹⁄₄-mile (6.8 km) loop begins at I-40 exit 121 on the west end of town and proceeds northward passing over the former SR 66, a local road still signed as a state route that is a former alignment of US 66. The loop then takes a semicircular path near the Seligman Airport returning to Historic US 66, where the loop turns east through town. At the eastern edge of town, the loop turns south returning to I-40 at exit 123.[3]^:418[9]

Major intersections

The entire route is in Seligman, Yavapai County.

mi[3]:418	km	Destinations	Notes
0.00	0.00	I-40 – Los Angeles, Flagstaff	Western terminus; I-40 exit 121
1.16	1.87	To SR 66 west (Historic US 66)
4.25	6.84	I-40 – Los Angeles, Flagstaff	Eastern terminus; I-40 exit 123
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

State Business Route 40 (2) (also known as I-40 BL) is a business loop of I-40 through Ash Fork in Yavapai County. The 1.5-mile (2.4 km) loop begins at I-40 exit 145 and proceeds to the northeast along the western edge of town. The loop passes through town as a divided route with eastbound traffic following Park Avenue and westbound traffic routed along Lewis Avenue. The roadways combine on the east end of town, and the loop returns south terminating at I-40 exit 146. The roadway continues south beyond I-40 as SR 89.[3]^:419–420[10]

Major intersections

The entire route is in Ash Fork, Yavapai County.

mi[3]:419–420	km	Destinations	Notes
0.00	0.00	I-40 – Los Angeles, Flagstaff	Western terminus; I-40 exit 145
1.49	2.40	I-40 / SR 89 south – Los Angeles, Flagstaff, Prescott	Eastern terminus; I-40 exit 146; road continues south as SR 89
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Route transition

State Business Route 40 (3) (also known as I-40 BL) was a business loop of I-40 through Flagstaff in Coconino County. The 4.0-mile (6.4 km) loop began at I-40 exit 161 west of Williams and took Historic Route 66 into town. In the town center of Williams, the eastbound and westbound lanes of the loop diverged into a one way pair near 9th Street. The eastbound lans used the appropriately named "Route 66" while the westbound utilized Railroad Avenue. A junction at 2nd Street provided access to I-40 exit 163 and the Grand Canyon Railway station. East of town, the westbound and eastbound lanes of the loop re-converged. The loop curved northeast at Bearizona Wildlife Park before arriving at a junction with I-40 exit 165. The diamond interchange served as the eastern terminus of the loop. The road continued straight ahead as Arizona State Route 64, which has its western terminus at exit 165.[11] This route was a former section of U.S. Route 66 and U.S. Route 89.[13] On August 16, 1990, ownership and maintenance of the business route was handed over to the city of Williams and the designation was decommissioned.[11][14]

Major intersections

The entire route was in Coconino County.

Location	mi[11]	km	Destinations[7]	Notes
​	162.00	260.71	I-40 – Los Angeles, Flagstaff	Western terminus; I-40 exit 161; road continued as Country Club Drive
Williams	163.62	263.32	Grand Canyon Boulevard to I-40	To I-40 exit 165
​	165.98	267.12	I-40 / SR 64 east – Los Angeles, Flagstaff, Grand Canyon	Eastern terminus; I-40 exit 165; highway continued north as SR 64
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Route transition

I-40 has both a current route traversing the city of Flagstaff in Coconino County and a former route previously on the city's east side.

State Business Route 40 (4) (also known as I-40 BL) is a business loop of I-40 through Flagstaff in Coconino County. The 6.7-mile (10.8 km) loop begins at I-40 exit 191 west of Flagstaff and enters the city following the former route of US 66. In central Flagstaff, the loop intersects SR 89A at Milton Road. The loop turns north and follows Milton Rd. and then turns east along the street known as Route 66 (formerly Santa Fe Avenue) before intersecting US 180 at Humphreys Street. The loop continues to the east side of Flagstaff, where Rte. 66 diverges carrying the former alignment of I-40 BL, before intersecting US 89. From this intersection, the loop turns southward along Country Club Drive until terminating at I-40 exit 201.[16]^:663–667[17]

Major intersections

The entire route is in Coconino County.

Location	mi[8]	km	Destinations	Notes
​	0.00	0.00	I-40 – Los Angeles, Albuquerque	Western terminus; I-40 exit 191
​	0.53	0.85	East end state maintenance
Flagstaff	1.90	3.06	West end state maintenance at Flagstaff city limits
	4.20	6.76	SR 89A south (Milton Road) to I-17 / I-40 – Sedona, Phoenix	Former US 89A
	4.81	7.74	US 180 west (Humphreys Street) – Arizona Snow Bowl, Grand Canyon, Museum of Northern Arizona	West end of US 180 overlap
	8.57	13.79	Fanning Drive	East end state maintenance
	9.14	14.71	US 89 north – Page	Former interchange, now an at-grade T-intersection
	9.67	15.56	I-40 west to I-17 – Phoenix, Los Angeles I-40 / US 180 east – Albuquerque	ADOT signs this as eastern terminus; east end of US 180 overlap; I-40 exit 201; road continues south as Country Club Drive
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

State Business Route 40 (5) (also known as I-40 BL) was a former business loop on the east side of the city of Flagstaff in Coconino County. The 4.6-mile (7.4 km) loop began at the combined route of I-40 BL and US 180 and followed Santa Fe Avenue eastward underpassing the current business route. The loop continued along the former US 66 connecting with I-40 and US 180 at exit 204 for Walnut Canyon Road along the city's eastern edge. The loop was decommissioned in 2008 and returned to the city for maintenance.[3]^:423[16]^:668[18]

Major intersections

The entire route was in Flagstaff, Coconino County.

mi[16]:668	km	Destinations	Notes
0.00	0.00	I-40 BL / US 180 (Santa Fe Avenue) – Grand Canyon	Western terminus
4.64	7.47	I-40 / US 180 – Los Angeles, Albuquerque	Eastern terminus; I-40 exit 204
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

State Route 40 Spur (SR 40S) (also known as I-40 BS) is a business spur of I-40 located in Navajo County, serving the city of Winslow. The 1.2-mile (1.9 km) spur begins at I-40/US 180 exit 252 and follows Hipkoe Drive south while concurrent with SR 99. At the intersection with 3rd Street, the two highways split; SR 99 heads east, while I-40 BS heads west. After crossing over the BNSF railway, the spur continues for 0.19 miles (310 m), ending just north of the intersection of Cooperstown Road and the county line.[19]

Major intersections

The entire route is in Navajo County.

Location	mi[8][19]	km	Destinations	Notes
​	0.00	0.00	Winslow Industrial Spur	Continuation beyond western terminus
​	0.18	0.29	Bridge over BNSF railway
Winslow	1.01	1.63	SR 99 south to SR 87 (3rd Street) – Payson	West end of SR 99 concurrency
	1.2	1.9	SR 99 north / I-40 (US 180) – Flagstaff, Albuquerque	Eastern terminus; east end of SR 99 concurrency; I-40 exit 252; road continues north as Hipkoe Drive
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

The former State Business Route 40 (6) (also known as I-40 BL) in Winslow ran along former US 66 from exits 252 to exit 255.

State Business Route 40 (7) (also known as I-40 BL) in Joseph City runs along former US 66 from exits 274 to exit 277.

State Business Route 40 (8) (also known as I-40 BL) in Holbrook runs along part of current U.S. Route 180 in Arizona and former US 66 as well as Arizona State Route 77 from exits 285 to exit 289.

The former Business Route 40 in Gallup, New Mexico ran along part of former US 66 from an interchange at exit 16 to another interchange at exit 26.

The former Business Route 40 in Grants, New Mexico ran along part of former US 66 from an interchange at exit 79 in Milan to another interchange at exit 85. It also had a connecting spur at Exit 81.

The former Business Route 40 in Albuquerque, New Mexico ran along part of former US 66 from a former wye interchange at eastbound exit 149 to a half-diamond/partial cloverleaf interchange at exit 167. The wye interchange was rebuilt between 2009 and 2011 for Atrisco Vista Boulevard for the conversion of that interchange from a westbound half-diamond interchange to a full diamond interchange.

Business Route 40 in Moriarty, New Mexico runs along part of former US 66. It begins at a trumpet interchange at exit 194 and begins traveling east intersecting NM 333. It continues west after that intersecting NM 41 before reaching its eastern terminus at a flyover interchange with an additional east-to-west ramp at exit 197.

The entire route is in Moriarty, Torrance County.

mi[22]	km	Destinations	Notes
0.000	0.000	I-40	Western terminus; I-40 exit 194; trumpet interchange
		NM 333 west – Edgewood	Eastern terminus of NM 333
		NM 41 – Galisteo, Estancia
2.922	4.703	I-40	Eastern terminus; I-40 exit 197; flyover interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Business Route 40 in Santa Rosa runs along former US 66 from exits 273 to exit 277. It also overlaps part of U.S. Route 54 and all of U.S. Route 84. Along the way it also intersects the northern terminus of NM 91.

The entire route is in Santa Rosa, Guadalupe County.

mi[22]	km	Destinations	Notes
0.000	0.000	I-40 / US 84 – Albuquerque, Tucumcari	Western terminus; I-40 exit 273
		US 54 south	Western end of US 54 concurrency; serves Guadalupe County Hospital
		NM 91 south – Softball complex, National Guard armory	Northern terminus of NM 91
		I-40 (US 84) – Albuquerque, Tucumcari	I-40 exit 275
4.367	7.028	US 54 east / I-40 / US 84 – Tucumcari, Albuquerque	Eastern terminus; eastern end of US 54 concurrency; I-40 exit 277; highway continues south as US 84
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

Business Route 40 in Tucumcari, New Mexico runs along part of former US 66 from a trumpet interchange at exit 329 to a diamond interchange at exit 335. It intersects NM 104 and NM 209 in the center of Tucumcari.

The entire route is in Tucumcari, Quay County.

mi[22]	km	Destinations	Notes
0.000	0.000	I-40 (US 54) – Amarillo, Albuquerque	Western terminus; I-40 exit 329; trumpet interchange
		NM 237 east (Bus. Loop US 54)	Western terminus of NM 237
		NM 104 west (First Street north) / NM 209 south (First Street south)	Eastern terminus of NM 104, northern terminus of NM 209
		US 54
7.652	12.315	I-40 – Amarillo, Albuquerque	Eastern terminus; I-40 exit 335; diamond interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

The Glenrio business spur of Interstate 40 begins at I-40 on exit 0 just east of the New Mexico-Texas state line. The highway runs south from the interchange towards Former route 66, then turns west along that decommissioned route where it terminates at the Texas-New Mexico State Line.

The Adrian business loop of Interstate 40 begins at I-40 at exit 22 and runs along Former route 66 to exit 23, the latter of which also includes the norther terminus of TX 214.

Route description

Bus. I-40 B begins and ends at on-and-off ramps leading to and from two-way frontage roads along I-40, which in the case of the one on the northbound side, a genuine former section of Route 66. Eastbound BL-40 immediately turns north on Oldham County Road 22, which runs across an overpass above I-40 before terminating at Historic US 66, then turns right, where it encounters the official Midway Point of historic US 66, as well as a café and motel focused on this theme. East of there at the intersection with Grand Avenue, the post office is diagonally across from a campground, and beyond that point the road runs past some silos. When the route intersects the westbound off-ramp for Exit 22, which is the official westbound beginning of BL-40, eastbound BL 40 runs towards the northern terminus of TX 214, then turns south overlapping that route until it runs above I-40 again, before turning east on the frontage road until finally leaving at the on-ramp ending at I-40 itself.

The Vega business loop of Interstate 40 runs along Former route 66 between two modified trumpet interchanges at exits 35 and 37. It is officially designated as Business Interstate 40-C by the Texas Department of Transportation.

Route description

Bus. I-40 C begins and ends at on-and-off ramps leading to and from two-way frontage roads along I-40, which in the case of the one on the northbound side, a genuine former section of Route 66. Eastbound BL-40 immediately turns southeast, away from the former Choctaw, Oklahoma and Gulf Railroad line, which was acquired and later abandoned by the Rock Island Railroad.[26] The surrounding landscape is completely barren until the road encounters a hotel. From 14th to 13th Streets, the road curves from southeast to straight east. The sole main intersection along the route is U.S. Route 385 (South Main Street), which contains intersection beacons. Though all of BL-40 is named Route 66, as well as Vega Boulevard, an older segment of the iconic route turned north in an overlap with US 385, and turned west onto West Main Street ending just east of where the intersection with the eastbound exit 35 ramps are. Between 7th and 6th Streets, BL 40 passes a Texas DOT construction and maintenance facility, and then curves southeast again east of Third Street to follow along the south side of the former Choctaw Route. After the intersection with First Street, the surroundings become barren once again, with the exception of one ranch on the south side. BL-40 C ends at Exit 37 on I-40, and the former segment of US 66 along the north side continues as one of the two I-40 frontage roads.

The Amarillo business loop of Interstate 40 begins at I-40 exit 62A just west of Amarillo. The highway was formerly a business route for Route 66, being that highway's only bannered route in Texas. Bus. I-40 D is known locally as Amarillo Boulevard and is the longest business route of Interstate 40.

Route description

Bus. I-40 D begins at Interstate 40 exit 62A just west of Amarillo near Cadillac Ranch. The highway runs east through a low developed area before entering the Amarillo city limits just before an intersection with Loop 335 (Soncy Road). Bus. I-40 D turns northeast at an interchange with Coulter Street/Wolffin Avenue before briefly running north at an interchange with SW 9th Avenue/Bell Street (near the main campus of Amarillo College). The highway starts turning northeast at Tascosa Road/Gem Lake Road before running straight east at the N. Western Street interchange. After this interchange, Bus. I-40 D begins to travel through a heavily developed area of the city before meeting U.S. Route 60/U.S. Route 87/U.S. Route 287 just north of downtown and begins an overlap with U.S. Route 60. The two highways continue to travel through a heavily developed area of the city, with the development becoming more sparse after the State Highway 136 intersection. Bus. I-40 D becomes a divided highway after an interchange with Loop 335 (Lakeside Drive) and runs along the northern border of Rick Husband Amarillo International Airport. Just after leaving the Amarillo city limits, U.S. Route 60 leaves the highway and Bus. I-40 D starts to run southeast. Bus. I-40 D meets its eastern terminus at I-40 exit 85.

Junction list

County	Location	mi[28]	km	Destinations	Notes
Potter	​	0.00	0.00	I-40 west	Interchange; no direct access to I-40 east; I-40 exit 62A
	Amarillo	2.1	3.4	Loop 335 (Soncy Road)
		2.8	4.5	Wolffin Avenue / Coulter Street / Hagy Road / Port Lane	Partial interchange; Wolffin Rd. not signed westbound, Hagy Rd. and Port Ln. not signed eastbound
				Bell Street	Interchange
		4.3	6.9	SW 9th Avenue (Loop 279 east)	Former Bus. US 66
		5.0	8.0	RM 1061 north (Tascosa Road)
		6.2	10.0	FM 1719 north (Western Street)	Interchange
				US 287 south (Taylor Street)	One-way street
				US 87 north (Fillmore Street)	One-way street
				US 60 west / US 87 south (Pierce Street)	One-way street, outbound access only to US 60; west end of US 60 overlap
				US 287 north / US 60 (Buchanan Street)	One-way street, inbound access only from US 60
		11.4	18.3	Lake Street	Interchange
		12.1	19.5	SH 136 north – Borger
		14.4	23.2	Loop 335 (Lakeside Road) – Rick Husband Amarillo International Airport	Interchange
		17.6	28.3	B Avenue – Amarillo College East Campus	Partial interchange
		19.8	31.9	FM 1912 (Masterson Road)	Interchange
	​	20.3	32.7	US 60 east – Panhandle	East end of US 60 overlap
Carson	​	24.3	39.1	FM 2575
	​	24.4	39.3	I-40 – Oklahoma City, Amarillo	Interchange; no access from EB I-40; I-40 west exit 85
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

The Groom business loop of Interstate 40 begins at I-40 at exit 110 and runs along Former route 66 to exit 114. Officially designated as Business Interstate 40-F by the Texas Department of Transportation, it is one of the few business routes to run along the south side of I-40 in Texas, rather than the north side.

Route description

Business Interstate 40-F begins at the off-ramp for Exit 110 leading to the I-40 frontage road along the eastbound lanes, which suddenly becomes a divided highway named "Route 66." The first intersection is a connecting road to the parts of the interchange with the eastbound on-ramp, as well as the frontage roads along the westbound lanes, leading to the western terminus of the business loop. Shortly after this is the barely paved Carson County Road BB. The divided highway ends just west of TX FM 295 and Carson County Road CC (Western Avenue), and gains the additional name of "Front Street." The route runs along the edge of town as a four-lane undivided highway with the south side lined with numerous massive grain silos along the abandoned Chicago, Rock Island and Gulf Railway line until the intersection with TX FM 2300 (Eastern Avenue), and after passing by a TxDOT maintenance facility, the road become a divided highway once again. Little else exists along this segment. The last intersection is another connecting road to the eastbound off-ramp of Exit 114, the frontage roads along the westbound lanes leading to the western beginning of the business loop, and an unorthodox roadside attraction known as the Leaning Tower of Texas. Business Interstate Route 40-F ends at the on ramp to eastbound I-40, as does the divided former US 66, which is converted back into the frontage road along the eastbound lanes of I-40.

The McLean business loop of Interstate 40 runs from exit 141 to 143. Officially designated as Business Interstate 40-H by the Texas Department of Transportation, it begins at I-40 at an eastbound flyover interchange and runs northeast along Former route 66. Before the intersection with 26th 1/2 Road, it curves to the southeast. After the intersection with Texas Highway 273, it splits into a one way pair with eastbound BL-40 H continuing along Railroad Street, and westbound BL-40 H moving onto First Street, one block to the north. This one-way pair runs through the McLean Commercial Historic District and comes to an end just at the intersection with a connecting road that brings Eastbound BL-40-H traffic under I-40 and then loops back from the south I-40 frontage road to end at I-40.

The Shamrock business loop of Interstate 40 is the easternmost business route of I-40 in Texas, running from exit 161 to exit 164, along historic US 66. Officially designated as Business Interstate 40-J by the Texas Department of Transportation, it is another business route that runs along the south side of I-40 in Texas, rather than the north side.

Route description

Business Interstate 40-J begins at the off-ramp for Exit 161 leading to the I-40 frontage road along the eastbound lanes, which just as in Groom, suddenly becomes a divided highway named "Route 66." After passing a gas station and a former intersection with Wheeler County Road 15, the first intersection with this Business Loop is the unmarked Texas State Spur 556, which is also a connecting road running underneath I-40 leading to the frontage roads along the westbound lanes, as well as the western terminus of the business loop. Unlike Groom, no eastbound on ramp exists here, and the divided highway ends immediately after Spur 556 in order to become a four-lane undivided highway. Further into town former Route 66 gains the name of West 12th Street, and the only signalized intersection along the entire route is U.S. Route 83 in Texas (Main Street) where the NRHP-listed U-Drop Inn can be found on the northeast corner. From there, the road is named East 12th Street. Commercial development along the road, which began four blocks west of US 83 at North Arizona Street, consist mainly of motels, restaurants, and local car culture oriented businesses, some of which focuses on the roads former status as Route 66. The commercial strip ends after a dirt road named North Tennessee Street.

"Route 66" splits from East 12th Street at an intersection that's another connecting road to the eastbound off-ramp of Exit 164, the then runs over the overpass above I-40 to turn right at the frontage road along the westbound lanes leading to the western beginning of the business loop. Eastbound Business Interstate Route 40-J narrows down to a two-lane undivided highway before passing by a TxDOT construction and maintenance facility, and then leaves the frontage road at the on ramp to eastbound I-40, where it meets its terminus. The frontage roads along both sides of I-40 continue through three more interchanges before crossing the Texas-Oklahoma State Line.

The Erick business loop of Interstate 40 is the first business route of I-40 in Oklahoma. It begins on exit 5 (Honeyfarm Drive) and runs south into North 1720th Road until that street ends at a four-lane divided highway known as East 1240th Road (former Route 66), where it turns east. The next intersection is Oklahoma State Highway 30, which overlaps Bus. I-40 from that point on. BL-40/OK 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. BL-40 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. BL-40 finally ends at a folded-diamond interchange with I-40, known as exit 11.

The Sayre business loop of Interstate 40 is the second business route of I-40 in Oklahoma. It runs north from exit 20 overlapping much of U.S. Route 283 as a four-lane divided highway until the intersection with Greer Avenue where it becomes four-lane undivided highway. The sole major intersection downtown is West and East Main Streets, which are part of Oklahoma State Highway 152. Between Maple and Poplar Avenues, the BL-40/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. BL-40 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.

The Elk City business loop of Interstate 40 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 OK 6 that runs along the route until OK 6 turns south at North Main Street. From there it snakes through the northeastern part of the city and after the intersection with OK 34 finally terminates with I-40 at westbound exit 41.

Route description

The route begins at a left exit in a wye interchange with Interstate 40, which also serves as a connection to southbound Oklahoma State Highway 34. The first intersection along this route is BK 29, which leads to OK 34, and was the west end of an overlap with OK 34 until 1987. The road continues to run northeast, then after encountering an intersection with OK 6, which joins BL-40 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, OK 6 turns south at the intersection with North Main Street.

Crossing a bridge over a tributary to Elk Creek, BL-40 makes a sharp curve to the left and heads north at Third 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 OK 34 is a sign of the beginning of the end for BL-40, because south of this intersection is an approach to a westbound on-eastbound off wye interchange with I-40. Immediately after this intersection, BL-40 ends at an eastbound on-westbound off wye interchange with I-40.

Major intersections

The entire route is in Beckham County.

Location	mi	km	Destinations	Notes
​	0.00	0.00	I-40	Western terminus; I-40 exit 32
Elk City			To SH-34	Former west end of OK 34 overlap
			SH-6 west (BKR)	West end of OK 6 overlap
			SH-6 east (North Main Street)	East end of OK 6 overlap
			SH-34 to I-40 west	South to EB exit 41 on I-40
			I-40 east	Eastern terminus; I-40 WB exit 41
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

The Clinton business loop of Interstate 40 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 re-entry, 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 Oklahoma State Highway 73, and ironically west of the original US 66. The divider becomes less prominent north of that intersection, briefly becoming non-existent 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. BL-40 doesn't overlap any former segments of US 66 until 10th Street. With some exceptions, BL 40 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 First 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 non-abandoned former Kansas City, Mexico and Orient railroad line now run by the Farmrail and Grainbelt Railroads.[32] 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[33] and a branch of the Lucky Star Casino.[34] The last intersection is North 2280th Street before BL 40 ends at a wye interchange with I-40 at exit 69.

The Weatherford business loop of Interstate 40 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

BL-40 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, the route turns east onto West Main Street. West of this intersection, West Main has no designation but connects to OK 54. West Main Street becomes East Main Street at the intersection with North and South Custer Streets. East of Washington Avenue BL-40 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.

The El Reno business loop of Interstate 40 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

BL-40 begins at a trumpet interchange with Interstate 40/U.S. Route 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 narrows as the road 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, BL-40 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, BL-40 intersects US 81 (Chisholm Trail) at South Choctaw Avenue and joins the route in a southbound concurrency. For one block BL-40/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 towards the east as it briefly intersects and takes over the alignment of Southeast 27th Street. BL-40/US 81 avoid a sharp right turn onto South Shepherd Avenue through a long east to south turning ramp, but still intersects the western terminus of Oklahoma State Highway 66. Almost immediately, BL-40 ends 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 towards Chickasha, Bowie, Texas, and Fort Worth, Texas.

Major intersections

The entire route is in Canadian County.

Location	mi	km	Destinations	Notes
​	0.00	0.00	I-40 / US 270 – Amarillo, Oklahoma City	Western terminus; I-40 exit 119
El Reno			US 81 (Choctaw Avenue north)	West end of US-81 overlap
			Bridge over UP/AT&L connecting line
			SH-66 east – Yukon	Western terminus of SH-66; former US-66 east
			I-40 (US 270) / US 81 south – Oklahoma City, Amarillo, Chickasha	Eastern terminus; I-40 exit 125; east end of US 81 overlap; highway continues as US-81 south
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

The Henryetta business loop of Interstate 40 is the seventh business route of I-40 in Oklahoma, running from exit 237 to exit 240, along US Business Routes 62 and 75, as well as part of US 62-75. It is the first business route along I-40 in the state that's not a former segment of US 66.

Route description

BL-40 begins at a diamond interchange with Creek Mine Road. Immediately after the westbound off and on ramps 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 intersects the former Oklahoma State Highway 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,[35] 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,[36] West Main Street becomes East Main Street at Lake Road, where the fourth traffic signal in town can be found. U.S. Business routes 62 and 75 end at US 62–75, but BL-40 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.

The Sallisaw business loop of Interstate 40 is the last business route of I-40 in Oklahoma, running from exit 308 (US 59) to exit 311 (US 64).

Route description

BL-40 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 BL-40 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 BL-40 continues to follow US 64, along East Cherokee Avenue, which become a four-lane undivided highway before Wheeler Avenue. East of North Dogwood Street, BL-40/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. BL-40 ends at a partial cloverleaf interchange with I-40 known as Exit 311, while US 64 continues towards 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.