Spread out over 5,000 square miles, arguably the most accessible way to see the Black Hills is by car—or motorcycle, but we’ll get to that later. There are three main roads into and out of the region. Interstate 90 traverses east and west, Highway 16 runs south and west out of Rapid City, and Highway 79 takes us north and south through the area. Our trip planner has more suggestions for how to plan the perfect road trip. Interstate 90, Drive App, Perfect Road Trip