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East of Tucson, I‑10 parallels and, in some cases, overlies old US 80 to Benson, and was originally cosigned as US 80 and SR 86. The section of I-10 from Valencia Road to Rita Road was the first construction project in the state of Arizona funded by the Federal Aid Highway Act of 1956. Construction began in 1957 and was completed in 1960.
The Arizona Department of Transportation (ADOT) is the agency responsible for building and maintaining the Interstate Highways in the Arizona State Highway System. These highways are built to Interstate Highway standards , which are freeways that have a 75-mile-per-hour (121 km/h) speed limit in rural areas and a 65 mph (105 km/h) speed limit ...
Interstate 10 (I-10) is the southernmost transcontinental highway in the Interstate Highway System of the United States. It is the fourth-longest Interstate in the country at 2,460.34 miles (3,959.53 km), following I-90, I-80, and I-40. It was part of the originally planned Interstate Highway network that was laid out in 1956, and its last ...
In 2011, ADOT started a study to connect SR 210 to I-10 at Alvernon Way in southeast Tucson. [10] The new roadway would be built to freeway standards from I-10 to the current terminus at Golf Links Road. [11] In December 2020, ADOT released final design concept report on the extension as part of the I-10 widening project.
In 1988, US 64 was extended from New Mexico into Arizona over SR 504 to US 160 in Teec Nos Pos. [32] Coincidentally, the small section of US 64 in Arizona was once designated as a section of SR 64. [33] US 80 was eliminated from Arizona in 1989, after both Arizona and New Mexico had requested AASHTO to remove the designation from both states. [34]
The final part was to construct the El Mirage Road interchange. This began in February 2015 and was complete in summer 2016. This marked the first time the entire Loop 303 between I-10 and I-17 was fully upgraded to freeway standards. [3] In February 2016, construction began on the south half of the I-10 and Loop 303 stack interchange.
SR 87 begins 0.95 miles (1.53 km) to the north of I-10 at a junction with an unsigned orphan segment of SR 84, which serves as a direct connection to I-10 at Exit 211. [1] SR 87 travels north for 16 miles (26 km) toward Coolidge, passing by the town of Eloy. In Coolidge, State Route 87 is known as Arizona Boulevard.
The SR 84A designation was retired two years later in favor of the I-10 designation. [26] Between 1961 and 1962, SR 84 was reconstructed into I-10 from Miracle Mile to Picacho. Construction of I-10 through Marana resulted in its downtown area being demolished. [13] By 1963, work was underway to turn SR 84 west of Casa Grande into Interstate 8. [27]