The M25 or London Orbital Motorway is a  motorway that almost encircles Greater London, England (with the exception of North Ockendon), in the United Kingdom. A narrower concept was first mooted in the 1960s as part of the plan to build four ring roads around London. A few sections, based on the abandoned London Ringways plan, were constructed in the early 1970s and it was completed in 1986.