Metrication in the United States
Interstate 19
Interstate 19 (I-19) is a north–south Interstate Highway located entirely within the US state of Arizona. I-19 travels from Nogales, roughly 90 meters (300 ft) from the Mexican border, to Tucson, at I-10. The highway also travels through the cities of Rio Rico, Green Valley, and Sahuarita. Having a total length of just over 102 kilometers (63 mi), I-19 is the seventh-shortest primary (two-digit) Interstate Highway in the contiguous 48 states, where only I-87 (North Carolina), I-97, I-86 (Idaho), I-14, I-11, and I-2 are shorter. While the highway is short, it is a very important corridor, serving as a fast route from Tucson and Phoenix (via I-10) to the Mexican border. The highway is a portion of the United States section of the CANAMEX Corridor, a trade corridor that stretches north from Mexico across the United States to the Canadian province of Alberta. (Wikipedia).
