[4] On December 17, 1984, the SR 93 designation was removed south of the Grand Avenue/Van Buren Street/7th Avenue intersection in Phoenix.

[3] By 1935, the American Association of State Highway Officials (AASHO) had received two extension requests for U.S. Route 93 south of what was then its southern terminus in Glendale, Nevada.

At a later time, he reconsidered and sent a second request for US 93 multiplex with US 466 over the new Boulder Dam into Arizona and end at US 66 in Kingman.

The first extension proposal called for US 93 to end in Phoenix, being extended from Kingman by way of US 66 through Ash Fork.

[6] Upon hearing of the proposed extensions, citizens of Wickenburg, Arizona, Wikieup and Aguila protested to have US 93 run through their towns instead.

[13] The Arizona Highway Department renewed and modified its earlier extension proposal of US 93 on April 30, 1965.

The U.S. Route Numbering Committee of the AASHO considered this action on June 28, 1965, but the idea was ultimately denied.

According to the AASHO, the route was substandard in many areas, didn't carry nearly enough traffic to justify U.S. Highway status and part of the road had yet to be completed to Wickenburg.

Part of the proposal was reconsidered on June 28, 1965, approving an extension of US 93 between Kingman and Wickenburg under the condition that substandard areas of the road were improved quickly.

In 1991, the AASHTO approved a request from the Arizona Department of Transportation to eliminate all of US 89 south of Flagstaff.

At Grand Ave.'s terminus, located at Van Buren Street and 7th Avenue (Five Points), the quartet of highways picked up U.S. Route 80 from San Diego.

On Van Buren Street, the "SR 93" emblem was at the bottom of the 60-70-80-89-93 totem pole for years (along with Business Loop 10 in the 1970s and '80s).

[2][10] At downtown Mesa's Country Club Drive, SR 93 made a south turn and was co-signed with State Route 87.

The middle section of this road was abandoned to the Gila River Indian Community in 1973[15] after it was overlapped by the adjacent Interstate 10 freeway in 1970.

The 1960-era highway exists nearly unchanged from Tucson to Green Valley, east of the new Interstate 19 and in Nogales.