Interstate 19, Interstate freeway in Arizona, United States
Interstate 19 is a federal highway that stretches approximately 63 miles from Tucson to the Mexican border at Nogales. The route passes through both Pima County and Santa Cruz County, crossing relatively flat terrain with scattered development.
Construction of this federal highway took place between 1962 and 1978, making it an important link in the expanding Interstate system. The road was built to strengthen economic and transportation connections across the region during a period of national infrastructure growth.
The road displays bilingual signs in English and Spanish, reflecting the strong cross-border ties of the area. Travelers notice how daily life here is shaped by this proximity to the international boundary.
Rest areas and fuel stations are distributed along the entire route, offering basic services to travelers. The highway passes through desert terrain, so drivers should be prepared for hot conditions and limited facilities in some stretches.
This is the only federal highway in the United States that uses kilometers instead of miles for all distance signs and exit numbers throughout its entire length. Drivers from other states often find this metering system surprising and visually different from what they expect.
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