History
The beltway was constructed in a clockwise fashion beginning at Leverkusen. In 1936 the section between Leverkusen and Cologne-Mülheim was built as a component of the Autobahn Oberhausen-Wiesbaden and in 1937 the section to Siegburg was finished. Thus today's Ostring (East-Ring) was drivable at that time. In 1941, the Rodenkirchener Autobahnbrücke was completed and the connection between the A 3 and the Autobahn to Bonn (today A 555) was established.
From 1957 to 1960 the Autobahn Cologne-Aachen was finished and the section from Kreuz Köln-Süd to the later Kreuz Köln-West was put into service in 1958. Construction of a second Autobahn-bridge across the Rhine in the north of Cologne began in 1961. At its completion, the beltway could be used along its entire length.
In 1971, the A 1 was extended to the south beyond the Köln-West interchange and in 1974 the A 4 was connected to the A 3 from the east at the Köln-Ost interchange. Since then, the section between interchanges Kreuz Köln-Ost and Dreieck Heumar consists of two Autobahns, the A 3 and the A 4.
Read more about this topic: Cologne Beltway
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