By Linda Tancs
In 1930, the mile-long Zion-Mount Carmel Tunnel was the longest of its type in the United States, created to provide direct access to Bryce Canyon and Grand Canyon from Utah’s Zion National Park. The sandstone tunnel is one of the busiest areas of Zion National Park, the first national park in the state. In fact, vehicles exceeding 7 feet 10 inches (2.4 meters) in width and/or 11 feet 4 inches (3.4 meters) in height require a tunnel permit to pass through. RVs and campers, take note.