M25 motorway and Thurrock off junction 31 (to the east of London). Cobham services opened on 13 September 2012. Originally, the M25 was unlit except for sections around Heathrow, major interchanges and Junctions 23–30. Originally, low pressure sodium (SOX) lighting was the most prominent technology used, but widening projects from the 1990s onwards have all used high-pressure sodium (SON) lighting and this has diminished the original installations. By 2014 only one significant stretch was still SOX-lit (Junction 25–26) and the units were removed the same year. The motorway passes through five counties. Junctions 1A–5 are in Kent, 6–14 are in Surrey, 15–16
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airport is served by London Buses services: The express shuttle buses, which formerly ran to various destinations, were withdrawn after the DLR line was built.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