The ADOT Parkways, Historic and Scenic Roads program continues to recognize certain sections of former US 66 as Historic Route 66. The longest sections of the designated historic route follow the original US 66 between Topock and Seligman through Oatman and from Flagstaff to Winona. Other smaller sections of Historic Route 66 comprise former US 66 segments that are currently or were once designated as I-40 Business. This is the case in Ash Fork, Williams, Winslow and Holbrook. Flagstaff is the only city in Arizona where the Historic Route splits into two alignments, the first along the aforementioned route to Winona and the second taking a small section of later US 66 to a junction with I-40 immediately east of Flagstaff. The discontinuous sections of Historic Route 66 are all connected by I-40. As there are no designated sections between Holbrook and New Mexico, the Arizona historic route officially has its eastern terminus in Holbrook.