Interstate 10 Arizona Descriptions

In Arizona, the highway is designated the "Pearl Harbor Memorial Highway". The portion through Phoenix is named the "Papago Freeway" and is a very vital piece of the regional freeway system. This designation starts at the initial junction/southern terminus of I-17 and runs westward out to AZ Loop 101, a loop route whose current western terminus is Interstate 10. Phoenicians more often than not refer to the freeway as "the I-10"(pronounced : the eye-ten).

From the southern terminus of Interstate 17 to the junction with the AZ Loop 202 freeway, the freeway is signed as the "Maricopa Freeway". This name holds true as well for I-17 from its southern terminus to its second junction with I-10, north of McDowell Road. From Loop 202 south to Interstate 8 (eastern terminus in Casa Grande), the freeway is signed as the "Pearl Harbor Memorial Highway". ADOT also has maps that show it as the Maricopa Freeway, while AAA and other sources show it as the Pima Freeway. The latter's name is used on a stretch of Loop 101 from U.S. 60 to Interstate 17.

In Tucson, the I-10 is called the Casa Grande Highway from the western edge of town to the eastern terminus of Business Loop 10, where it picks up the name, Tucson-Benson Highway from that route.

In Tucson, Arizona, between I-10 mileposts 259 and 260 are interchange ramps connecting I-10 with the northern terminus of Interstate 19 at its km post 100. I-19 leads 100 km south to its termination at the US-Mexico border at Nogales, Arizona (km post 0). Note that distance measurements on Interstate 19 are signed in metric units.

Also in Tucson, all exits between Prince Road and 22nd Street will be closed from June 2007 through spring 2010. I-10 is being widened from six to eight lanes, and seven bridges and underpasses are being built to deal with congestion. Plans are also under way to widen I-10 from Marana north to the I-8 interchange at Casa Grande from 4 lanes to 6 lanes starting in the later half of 2007 and continuing into 2008 and 2009.