North Circular Road
（重定向自North Circular）
![](/Images/godic/202501/30/London_north-south_circulars.svg0403.png")
![The Hanger Lane Gyratory on the North Circular is one of the most congested junctions in London, carrying over 10,000 vehicles per hour.](/Images/godic/202501/30/Hanger_Lane_geograph-3598317-by-Ben-Brooksbank0403.jpg")
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![Since 1951, the North Circular has been subject to speed limits along its route; these are now enforced by safety cameras.](/Images/godic/202501/30/A406_North_Circular_Road_-_geograph.org.uk_-_5800240403.jpg")
The North Circular Road (officially the A406 and sometimes known as simply the North Circular) is a 25.7-mile-long (41.4 km) ring road around Central London in England. It runs from Chiswick in the west to Woolwich in the east, and connects the various suburbs in the area, including Ealing, Willesden, Wembley, Southgate, Tottenham, Woodford and Barking. Together with its counterpart, the South Circular Road, it forms a ring road through the Outer London suburbs. 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.