The National Old Trails Road was an early transcontinental highway in the United States, established in the early 20th century. It connected the East Coast to the West Coast, facilitating travel and commerce. The road followed existing trails and routes, including parts of the historic Santa Fe Trail and Oregon Trail, and was significant in promoting the automobile culture. This route played a crucial role in the development of the American West, encouraging tourism and settlement. It was officially designated as a national road in 1913 and later became part of the U.S. Route 66 system, which further enhanced its importance in American transportation history.