At exit 330, US 66 diagonally crossed I-40 onto an abandoned road heading northeast into Chambers and crossed present-day US 191. US 66 proceeded east on the frontage road from the intersection with US 191, then rejoined I-40. Exit 339 in Sanders used to be an at-grade intersection where US 66 met its child route, US 666. From the intersection, US 666 southbound followed present-day US 191 to Springerville, Safford, Willcox and Douglas, while US 66 and northbound US 666 ran concurrently northeast along present-day I-40. Northeast of exit 341, US 66/US 666 followed Querino Dirt Road and crossed over Querino Canyon on the Querino Canyon Bridge. At exit 346, US 66/US 666 rejoined I-40, and followed the Interstate through Houck and Allentown. Immediately northeast of exit 354, US 66/US 666 followed the south frontage road alongside I-40 into the small hamlet of Lupton. East of Lupton, US 66/US 666 merged back into I-40 and crossed into New Mexico, then continued east towards Gallup.