The North Circular Road (officially the A406 and sometimes known as simply the North Circular) is a ring road around Central London in England. It runs from Chiswick in the west to Woolwich in the east via suburban North London, connecting various suburbs and other trunk roads in the region. Together with its counterpart, the South Circular Road, it forms a ring road around central London. This ring road does not make a complete circuit of the city, being C-shaped rather than a complete loop as the crossing of the River Thames in the east is made on the Woolwich Ferry.
Design
The road was originally designed to connect local industrial communities together in addition to bypassing London, and was constructed in the 1920s and 1930s. It received significant upgrades after World War II, and was at one point planned to be upgraded to motorway as part of the controversial and ultimately cancelled London Ringways scheme in the late 1960s. In the early 1990s, the road was extended to bypass Barking and meet the A13 north of Woolwich; the sections south from here to the ferry, in Beckton and North Woolwich, are labelled the A1020 and A117 respectively, instead of A406.
The road's design varies from six-lane dual carriageway to urban streets; the latter, although short, cause traffic congestion in London and are regularly featured on local traffic reports, particularly at Bounds Green. The uncertainty of development has caused urban decay and property blight along its route, and led to criticism over its poor pollution record. Several London Borough Councils have set up regeneration projects to improve the environment for communities close to the North Circular.
Route
The North Circular Road forms the northern part of a ring-road around Central London. It has seen substantially more investment than its counterpart, the South Circular Road, and consequently runs on more purpose-built road than urban streets, often coupled with demolition of existing houses and urban infrastructure. Although the route has alternative names at some points, it is generally referred to as the North Circular throughout for route planning purposes. The route is mostly grade-separated dual carriageway from the A40 at Hanger Lane to the A13 in Beckton except for the Drury Way/Brentfield Road junction, the Golders Green Road/Brent Street junction, Henlys Corner and the section from Bounds Green to Green Lanes. In areas where improvements made slowest progress and upgrades are unlikely, the original names such as Gunnersbury Avenue and Bowes Road are used.
Gunnersbury, Hanger Lane and Brent Cross
The road begins in Gunnersbury at the Chiswick flyover (junction 1 of the M4), from which the South Circular Road (A205) heads south over Kew Bridge, and the A4 heads east towards Chiswick and west towards Brentford. The first section runs along Gunnersbury Avenue through Gunnersbury Park to Ealing Common, with a mix of single and dual carriageways, where it becomes Hanger Lane. The road crosses the Great Western Main Line west of Paddington to the Hanger Lane gyratory system, a large roundabout on top of the Western Avenue (the A40) with Hanger Lane tube station. This is one of the busiest junctions in London, used by 10,000 vehicles an hour.
The A406 runs on purpose-built road to the north of the Hanger Lane Gyratory, and is referred to as "North Circular Road" on street signs. The road is a six-lane dual carriageway that connects the industrial estates in the area, and passes beneath the West Coast Main Line near Stonebridge Park. Beyond this, there is a junction with IKEA and the Neasden temple to the south-east, and the road runs alongside open land south of the Welsh Harp Reservoir. Beyond the reservoir, there is a large interchange with the Edgware Road (A5) and junction 1 of the M1 motorway at Staples Corner, and a junction for the Brent Cross Shopping Centre at the Brent Cross Interchange (joining the A41 from Finchley). This section of the North Circular was used for filming the car chasing sequences in Withnail and I.