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
M60 motorway 19-24) opening in October. The original plan called for a completely new motorway, but policy change led to the plan which created the current motorway. As soon as it opened, the motorway got close to its projected maximum volume on significant sections. As an orbital motorway, it is equivalent to London's M25 motorway; unlike the M25, the M60 forms a complete loop. In 2004, a section of the northern M60 was the UK's busiest stretch of road, with an average of 181,000 vehicles per day using the stretch between junctions 16 and 17. Usually, the western side of the M25