M25 motorway Europe's second longest orbital road after the Berliner Ring, which is . Originally built almost wholly as a dual three-lane motorway, much of the motorway has been widened: to dual four lanes for almost half, to a dual five-lanes section between junctions 12 and 14 and a dual six-lane section between junctions 14 and 15. Further widening is in progress of minor sections with plans for managed motorways in many others. To the east of London the two ends of the M25 are joined to complete a loop by the non-motorway A282 Dartford Crossing of the River Thames between Thurrock
London Borough of Croydon is linked into the national motorway network via the M23 and M25 orbital motorway. The M25 skirts the south of the borough, linking Croydon with other parts of London and the surrounding counties; the M23 branches from the M25 close to Coulsdon, linking the town with the south coast, Crawley, Reigate, and Gatwick Airport. The A23 connects the borough with the motorways. The A23 is the major trunk road through Croydon, linking it with central London, East Sussex, Horsham, and Littlehaven. The old London to Brighton road, passes through the west of the borough on Purley Way, bypassing the commercial