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
West London Orbital Line, Bakerloo Line, High Speed 2, Crossrail and the Piccadilly Line. It is anticipated the line will be operational by the mid-2020s, reflecting the fact that it makes use of existing under-used rail infrastructure rather than requiring significant lengths of new track or tunnels to be built. An unrelated scheme of the same name was previously proposed in June 2008 by the West London Business group. That proposal involved the construction of a new underground line across West and South West London and did not progress beyond concept stage. The West London Orbital line consists of a number of distinct