Zentrum today show, they exist essentially since 1975, when the A 1 direction Neustadt / Holstein was extended. At that time, the motorways in this area were thoroughly renewed: The 2 × 2 lane highway then came from the direction of Hamburg only until today's exit Lübeck center. Here, the highway crossed the Stockelsdorfer road. Today, the highway leads over it; this conversion took place around 1983. North of the exit Luebeck (with this name the departure was opened 1937, later it was called Luebeck middle) ran the lanes to three strips of altogether 17 meters width (with side banquets) together. A structural separation did not exist. The middle lane was intended for overtaking for both directions. The old route was in today's 6-lane route. About 500 meters south of the Schwartauer Dreiecks (approximately where the right lane becomes the turning strip), the old three-lane route deviated to the east and henceforth ran about 130 meters parallel to today's route. An approximately 160-meter-long section of this original route is still preserved in a forest near Elisabethstraße in Bad Schwartau. At the point where today the junction of the motorway towards Fehmarn and Lübeck-Siems (A 226) is located, was formerly a motorway junction as a left-hand trumpet, which - in contrast to today - was navigable in each direction. This triangle was still referred to as Eutiner branch in the 1950s. The continuous route led north towards Ratekau on the route of today's L 181 between the L 309 and the junction Sereetz the A 1. Also this stretch was three-lane with middle passing stripes. After about 1500 meters, the highway ended at a triangular junction south of Ratekau, where the route in the highway (today's L 309, then B 207) ended and found its end. This threading was officially called Eutin as a motorway junction, which at that time was not a geographical, but a pure direction determination. When the A 1 was extended in the early 1970s towards Neustadt, the Ratekauer branch line was cut off from the motorway network and downgraded to the national road. Until the 1990s, this section of the motorway was preserved in its original state. Thereafter, the road was extensively repaired. Bridge Noteworthy is the crossing of the bridge Schwartauer road: The bridge is still an original building and therefore as a motorway bridge wider than necessary today. The branch line to Lübeck-Siems (today's