The M20 motorway is a major road in the United Kingdom that connects London to the Channel Tunnel. It runs for approximately 50 miles, primarily through the county of Kent, and serves as a key route for both local and international traffic. Opened in 1974, the M20 facilitates travel to Dover and other coastal towns, making it essential for freight transport to mainland Europe. The motorway features several junctions that provide access to nearby towns and cities, enhancing connectivity in the region.