The M4 motorway is a major road in the United Kingdom that connects London to South Wales. It spans approximately 189 miles and serves as a vital transport link for both commercial and private vehicles. The motorway was officially opened in 1965 and has undergone several upgrades since then to improve traffic flow and safety. The M4 passes through several key cities, including Reading, Cardiff, and Bristol. It features multiple junctions that provide access to various local roads and services. The motorway is also known for its scenic views, particularly as it crosses the Bristol Channel and runs through the picturesque countryside of Wales.