East of Eloy, SR 84 is concurrent with the beginning 0.87 miles (1.40 km) of State Route 87 just north of Interstate 10 near Picacho.

Immediately east of the cattle farm, SR 84 enters Stanfield acting as the main street through town.

This late auto trail utilized a route through Maricopa alongside the Southern Pacific Railroad between Gila Bend and Casa Grande.

Unlike the Lone Star Trail, SR 84 took a more direct route through the mountains south of Maricopa to reach Gila Bend.

[8] This westward extension allowed SR 84 to become a shortcut for US 80 traffic to bypass Phoenix while heading to and from San Diego, California.

Originally, Williamson thought of the name Parkway Boulevard but felt Miracle Mile better suited his new business area.

The improved roadway was intended to handle large volumes of traffic safely and promote business growth, while also attracting national attention.

Construction also included the placement of two giant traffic circles at Casa Grande Highway and Drachman Street.

[13] In 1937, the eastern terminus of SR 84 was extended southeast along Miracle Mile, US 80 and US 89 to the intersection of Benson Highway and 6th Avenue.

Two German tourists were observed by locals, giving the Nazi salute to an SR 84 reassurance marker along Miracle Mile in Tucson.

Up to this point, the Arizona State Route shields sported a swastika inside an arrowhead below the highway number, which was meant to represent a Native American peace symbol.

Careful observation by highway officials concluded the swastika in use was the incorrect design for the Native American mark, but unintentionally matched the symbol used by Nazi Germany.

After weathering through the tire and gas shortages of World War II, business exploded along Miracle Mile due to a postwar population boom in Arizona causing a high demand for motel rooms.

[23] Between 1952 and 1955, the Highway 90 Association lobbied heavily within the state of Arizona to extend U.S. Route 90 west to San Diego from its terminus at US 80 in Van Horn, Texas.

The proposed route laid forward by the Association would, enter near San Simon and exit at the California border in Yuma.

The American Association of State Highway and Transportation Officials was set to make the ultimate decision regarding the proposed US 90 extension in December 1955.

[22] The popularity as a shortcut and high traffic levels along SR 84 ultimately lead to its decline as a major highway.