The southern section with 48 km length between the former junction Wiesbaden, today's Wiesbadener Kreuz, and the junction Limburg-Nord was opened on 23 September 1939 traffic. The most elaborate structure in this section was the then approximately 500 m long and 60 m high Lahntalbrücke. The 41.5 km long gap between Limburg and Dierdorf took place on 15 June 1940. The construction of the section south of the Wiesbadener cross with the Main Bridge between Raunheim and Eddersheim was started in 1938, but had to be discontinued in early 1943. The section from Erlangen to the Nuremberg junction was completed in 1941, partly in one lane.