Autopista de Circunvalación M-40
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The M-40, in Spanish transport, is a Madrid orbital motorway. It is the second-outermost of the Madrid orbital highways, the M-30 being the closest to the centre of Madrid. It surrounds 17 out of the 21 districts of Madrid[n 1] and the contiguous town of Pozuelo de Alarcón. In terms of length and surface surrounded, it may be compared to London's North and South circular roads, or Paris' A86 super-périphérique.