The M-50 orbital motorway is the outermost ring road of Madrid and its metropolitan area.

It runs at an average distance of 13.5 km (8.4 mi) from the Puerta del Sol.

The second ring is formed by the boundaries of Madrid's 19th Century Ensanche, following the proposed Paseo de Ronda.

Another section was also built from Majadahonda to the A-6 at Las Rozas, as part of the highway M-503, to be subsequently incorporated into the M-50.

Regional politicians of the Autonomous Government of Madrid have considered ending the ring between the A-6 and A-1, passing under El Pardo by building a tunnel and toll highway, independent of M-50; but for now, the drafting and subsequent implementation of a project in this regard, remains the responsibility of the General Directorate of Roads of the Ministry of Development, being the road is in the State Highway Network.