Autostrada A58 or Tangenziale Est Esterna di Milano ("Milan external east ring road") is an autostrada (Italian for "motorway") 32 kilometres (20 mi) long in Italy located in the region of Lombardy. It is the second east ring road of Milan after the Autostrada A51, managed by the company Tangenziale Esterna S.p.a. The Autostrada A58 ring road connects, on the east side of Milan, the Autostrada A4 with the Autostrada A1 via the Autostrada A35.
Together with the Autostrada A50 (Milan west ring road), the Autostrada A51 (Milan east ring road) and the Autostrada A52 (Milan north ring road), it is the largest system of ring roads around a city in Italy, for a total length greater than 100 kilometres (62 mi).[1] By adding the urban sections of Autostrada A1 and Autostrada A4, which runs parallel to the Milan north ring road by connecting Autostrada A51, Autostrada A50 and Autostrada A58, to the four ring roads, a system of urban highways that totally surrounds the city.
On 11 June 2012, the first construction site of the external ring road opens. On 23 July 2014, the entire section of the Autostrada A35 or BRE.BE.MI opens and with it also the first completed section of the external ring road, called "Arco TEEM, enters into operation.", to allow reaching the Pozzuolo Martesana and the Liscate barrier. The opening of the entire route took place on Saturday 16 May 2015, while 2016 was the deadline for the realization of all the related works.[2]
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