Autopista de Circunvalación M-30

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There is also an M30 motorway in Hungary

The M-30 ring road circles the inner Madrid area in Spain. Generally, it has three lanes in each way, supplemented in some parts by two-lane auxiliary roads. It connects to the main Spanish radial national roads that start in Madrid.

The M30 is the busiest Spanish road, famous for its traffic jams, and surrounded by several landmarks such as Torrespaña (the tallest structure in Madrid), the national headquarters of IBM, the mosque of the M30, and passes under the Vicente Calderón Stadium.

Its construction started in the 1960s and required the underground canalization of the Abroñigal river, required to avoid flooding since the road runs through the lowest part of the city. In the 1970s the most important section was open between the junction of Manoteras (cross with the A-1, M-11 and accesses to Sanchinarro) and the Nudo Sur (South Junction), that connects to the Avenida de Andalucia (previously N-IV) and A-4.

In the 1990s the ring was closed with the construction of the section between Avenida de la Ilustración (the only section of the road with traffic lights) and the junction of Puerta de Hierro (accession to Cardenal Herrera Oria street, M40, and El Pardo road).