The M25 motorway is a major ring road that encircles London, England. It spans approximately 117 miles (188 kilometers) and connects several key routes, facilitating travel to and from the capital. Opened in stages between 1975 and 1986, it serves as a vital artery for both local and long-distance traffic. The motorway is known for its heavy congestion, especially during peak hours, as it accommodates millions of vehicles each year. It features multiple lanes in each direction and includes several junctions that link to other major roads, enhancing accessibility to surrounding areas and regions.