Interstate 15 runs North South through the western United States. It starts in San Diego, and heads north through Las Vegas, Utah, Idaho and Montana. In Canada, the road turns into Highway 4 and heads through Calgary and north.
The road brings you through a variety of coastal, desert and mountain scenery, and passes through many of the major western cities.
Interstate 70 (51 pictures) I70 splits from I15 in Central Utah. I70 leads through the San Raphael Swell, the Rocky Mountains to Denver and points east.
Interstate 80 (103 pictures) I84 joins I15 near Tremonton, Utah.