Interstate 40

Length: 2,559 miles in total, 359 miles in Arizona
Existed since: 1960
Current Route in Arizona: California state line near Kingman to New Mexico state line near Lupton
Current Route Nationally: Barstow, CA to Wilmington, NC
Major Junctions: AZ 95, US 93, AZ 66, AZ 89, AZ 64 , I-17, AZ 89A, US 180, AZ 99, AZ 87, AZ 77, US 191

Interstate 40 has business loops in Seligman, Ash Fork, Flagstaff, Winslow, Joseph City, and Holbrook. All I-40 business loops run mostly along the old route of US 66. In Seligman BL 40 runs from I-40 at Exit 121 and ends at I-40 at Exit 123. In Ash Fork, BL 40 runs from Exit 145 to Exit 146 of I-40 along Park and Lewis Avenues. BL 40 in Flagstaff runs from I-40 at Exit 191 along old US 66 to AZ 89A. From there is heads north along Milton Rd, then along Route 66 through downtown Flagstaff to US 180 at Humphreys St. BL 40 then runs south on Country Club Dr and ends at I-40 at Exit 201. In Winslow, BL 40 runs from I-40 Exit 252 to 255 along old US 66 (partially). Through the town itself, the road is maintained by the town, however there are still parts of the road maintained by ADOT as marked on the State Highway System map. Exit signage also mentions the Business Loop still. In Joseph City, BL 40 runs along former US 66 from I-40's Exit 274 to Exit 277. Lastly, in Holbrook, I-40's business loop runs from I-40 eExit 285 to Exit 289. Formerly, there were business loops in Kingman, Williams, East Flagstaff, and Winslow. Until 2009, BL 40 in Kingman ran from Exit 48 along Beale St, then went north up Andy Devine Ave and ended at I-40 at Exit 53. In Williams, BL 40 was decommissioned in 1990. It ran from Exit 161 of I-40 through downtown to Exit 165 of I-40. In Flagstaff, until 2008 there was a second business loop for I-40. This route ran from the other BL 40 along Santa Fe Ave until I-40's Exit 204.

Business Spur 40

There is one business spur of I-40 that can be found in Winslow. It runs from I-40 at Exit 252 along Hipkoe Dr. It then turns on 3rd St, westward it ends just north of Cooperstown Road and the county line.