Transportation in Arizona

Highways, and state routes, many of which were funded by a ½ cent general sales tax measure approved by Maricopa County voters in 1985.

In the past decade, more than 100 miles (160 km) of new freeway have been constructed in the Phoenix metropolitan area by ADOT.

I-19 departs from I-10 in the southern part of Tucson, travels through southern Tucson (including an exit serving the historic Mission San Xavier) and the retirement community of Green Valley and terminates in Nogales, in Santa Cruz County, at the international border with Mexico.

Historic US 66, a major route for Midwestern emigrants prior to the advent of the interstate highway system, traversed the northern part of the state, passing through Flagstaff and Kingman.

Phoenix Sky Harbor is the seventh busiest airport in the world in terms of aircraft movements, and regularly in the top 15 for passengers.

In May 2006, voters in Tucson approved a Regional Transportation Plan (a comprehensive bus transit/streetcar/roadway improvement program), and its funding via a new half-cent sales tax increment.

The centerpiece of the plan is a light rail streetcar system (possibly similar to the Portland Streetcar in Oregon) that will travel through the downtown area, connecting the main University of Arizona campus with the Rio Nuevo master plan area on the western edge of downtown.