The A406 Road, also known as the North Circular Road, is a major road in London, England. It serves as a ring road that connects various neighborhoods and facilitates traffic around the city. The road runs approximately 20 miles, linking the A1 and A40 routes, and is crucial for both local and through traffic. The A406 is primarily a dual carriageway, allowing for faster travel between different parts of London. It passes through several boroughs, including Barnet, Enfield, and Hounslow, and is often busy, especially during peak hours. The road is essential for commuters and commercial transport in the area.