Bundesautobahn 4

is an autobahn that crosses Germany in a west-east direction. The western segment has a length of 156 km (97 mi), the part in the east is 429 km (267 mi) long. Works to continue the A 4 are in progress, but currently no plans exist to fill the gap completely.The A 4 starts north-west of Aachen, where the Dutch A76 enters Germany. Initially it is 2 lanes each way with no speed limit. From Kreuz Aachen to Düren and from Kerpen to Refrath (between Refrath and Köln-Merheim westbound the hard shoulder is the 3rd lane and only open at peak times) it has 3 lanes each way. Between Kreuz Köln-West and Kreuz Heumar it forms the southern part of the Cologne Beltway (Kölner Autobahnring). Between Eschweiler and Kreuz Aachen westbound there is a speed limit of 120 km/h. The whole rest of the section between Kreuz Aachen and Kreuz Köln-West has a variable speed limit. Between Kreuz Köln-West and Kreuz Heumar the speed limit is 120 km/h. From Kreuz Köln-Ost to Refrath there is a maximum limit of 100 km/h. The westbound section between Köln-Merheim and Kreuz Köln-Ost is restricted to 80 km/h. The section between Refrath and the current terminus at Krombach has no speed limit. Only between Untereschbach and Refrath westbound there is a 100 km/h speed limit from 6 - 10 am on weekdays. It is mostly 2 lanes each way, but between Untereschbach and Wiehl there are several additional climbing lanes in both directions.The eastern part starts at the Kirchheim intersection (with the A 7) and goes through Eisenach, Gotha, Erfurt, Weimar, Jena, Gera, Chemnitz and Dresden to Görlitz, where it crosses the border to Poland and continues as A4 (PL).