Interstate 15

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Interstate 15 (I-15) is the fourth-longest north-south transcontinental interstate highway in the United States, traveling through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The Utah and Arizona portions have been officially designated the 'Veterans Memorial Highway'
This highway's southern terminus is in San Diego, California at Interstate 8, 18 miles (29 km) north of the international border with Mexico. However, work is being done to extend this to Interstate 5. The current work on this extension is signed State Route 15. There is a continuous freeway between I-8 and I-5, but various intersections and acceleration/deceleration lanes are not up to interstate standards. The northern terminus is in Sweetgrass, Montana at the international border between the United States and Canada, where it becomes Alberta Highway 4.
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