This is a webcam showing PK 21.6 Ambos sentidos (M-40), located in Madrid, Spain. The M-40 is a Madrid ring road , with a length of 62 km and an average radius of about 10.07 km with respect to Puerta del Sol. The highway is called M-40 because it is the theoretical fourth ring road in Madrid. It is part of the European routes E-5 and E-90 .The first belt, M-10 , would be formed by the streets that follow the old route of the Felipe IV fence that formerly surrounded the city: the lower part of the Vega slope, the Ronda de Segovia, the Puerta de Toledo , the Ronda de Toledo , the Embajadores roundabout , the Valencia round, the Atocha roundabout, the Atocha roundabout, the Retiro’s exterior wall (currently, Menéndez Pelayo street, the first section of O’Donnell street and Alcalá street ), Paseo de Recoletos until the current Plaza de Colón, and the boulevards. The second belt, M-20 , would be made up of the “Rondas”: Avenida de la Reina Victoria , Calle de Raimundo Fernández Villaverde, Calle de Joaquín Costa , Calle de Francisco Silvela, Calle Doctor Esquerdo and Calle de Pedro Bosch. Finally, the third belt is the M-30 ring road.
