The A406, also known as the North Circular Road, is a major road in London, England. It serves as a ring road that connects various parts of the city, facilitating traffic flow around the central area. The road is approximately 20 miles long and is primarily used for local and regional traffic. The A406 runs through several boroughs, including Brent, Haringey, and Redbridge. It intersects with other important roads, such as the A40 and A13, making it a crucial route for commuters and commercial vehicles. The road is known for its heavy traffic, especially during peak hours.