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+title = "M-30"
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+The M-30 is Madrid's innermost ring road, circling the city centre at a
+radius of roughly 3–5 km from Puerta del Sol.
+
+It runs mostly underground through the Madrid Río tunnel section along the
+Manzanares river, built during the 2004–2007 renovation that reclaimed the
+riverbank as a public park.
+
+
+## Key junctions {#key-junctions}
+
+-   Nudo Norte — connects to A-1 (Burgos) and A-6 (La Coruña)
+-   Nudo Sur — connects to A-4 (Cádiz) and A-42 (Toledo)
+
+
+## See also {#see-also}
+
+-   [CRTM]({{< relref "crtm.md" >}})
+-   [Madrid Public Transport]({{< relref "../madrid-transport.md" >}})