U.S. Route 421 is a major highway that runs through the state of Kentucky. It stretches approximately 90 miles, connecting various towns and cities, including Richmond and Bardstown. The route serves as an important corridor for local traffic and commerce, facilitating travel across the region. The highway features a mix of rural and urban landscapes, offering scenic views of Kentucky's countryside. Along the way, travelers can access several attractions, including parks and historical sites, making it a popular route for both residents and visitors exploring the area.