sentences:  During construction of the first section of the motorway, the majority of the Ringways plan was cancelled and, in 1975 the plans for Ringway 3 were modified to combine it with parts of another motorway, Ringway 4, the outermost Ringway.The M16 designation was dropped and the combined motorway was given the designation M25 which had originally been intended for the southern and western part of Ringway 4.The section of Ringway 3 west of South Mimms anti-clockwise around London to Swanley in Kent was cancelled and the section clockwise from Potters Bar to the Dartford Tunnel was constructed between 1979 and 1982.The section of Ringway 3 south of the river between Dartford and Swanley was constructed between 1974 and 1977.