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Interstate 19 is an intrastate interstate highway located entirely within the state of Arizona, United States. It goes from Nogales, Arizona at the Mexican border to Tucson, Arizona at Interstate 10.
Length
| Miles | km
|
|
|
| 63.35 | 102 | Arizona
|
|
|
| 63.35 | 102 | Total
|
Major Cities Along the Route
Intersections with other Interstates
Spur Routes
None
- There are two Business Loops: One in Tucson, Arizona, and the other in Nogales, Arizona.
History
The entire route follows the routing of (former) U.S. Highway 89.
Notes
- Interstate 19 is unique amongst US Interstates, in that the distance measurements are given in kilometers, and not miles. Speed limit signs are still, however, in miles-per-hour. According to the Arizona Department of Transportation, this was originally done because of the metric system push in the United States at the time of the highway's original construction. Infrequently, there is talk of resigning the highway to miles, but the costs involved for what amounts to a rural Interstate dictate retaining the original markings.
- Nogales, Mexico is the only town to have the same name as its U.S. counterpart. From the Arizona town to the Mexican one, I-19 becomes Mexico Highway 15.
- A recent reconstruction project at the Interstate's northern terminus at Interstate 10 in Tucson, Arizona (at the interchange commonly called "The Crossing") was begun in 2002. It is scheduled to be completed in late 2004. [1] (http://www.1019crossing.com/)
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