M25 motorway re-examined as a motorway route in Sir Charles Bressey's and Sir Edwin Lutyens' "The Highway Development Survey, 1937". Sir Patrick Abercrombie's "County of London Plan, 1943" and "Greater London Plan, 1944" proposed a series of five roads encircling the capital. The northern sections of the M25 follow a similar route to the World War II Outer London Defence Ring, a concentric series of tanks and pillboxes designed to slow down a potential German invasion of the capital. Little was done to progress these plans until the 1960s when the Greater London Council developed its London Ringways plan consisting of four
London City Airport North Circular Road (A406). Also the A13 provides easy access to the M25 motorway, as with the A406 connecting to the M11 motorway. The airport has both a short-term and a long-term car park, both within walking distance of the terminal and a taxi rank outside the terminal door. The airport is served by London Buses services: The express shuttle buses, which formerly ran to various destinations, were withdrawn after the DLR line was built. Until 2006, Silvertown railway station on the North London line served the airport, but it was closed during the construction of Crossrail. When the new