|Length:||93 km (58 mi)|
It begins in the city of Magdeburg in Saxony-Anhalt at the Bundesstraße 71 (Magdeburg Ring). Just before the southern end of Magdeburg is the junction with the A 14 motorway. This is followed by the Langenweddingen ring road. This section was upgraded in the wake of the Langenweddingen train crash, in which 94 people were killed on 6 July 1967.
Shortly before Halberstadt it is crossed by the B 245 from Schwanebeck and Eilsleben, in Halberstadt it meets the B 79. The B 81 continues, linking the town of Halberstadt with the North Harz motorway, the B 6n, to the west. As a result, a similar autobahn-like expansion of this road section is one of the broader requirements listed in the Federal Transport Infrastructure Plan (Bundesverkehrswegeplan, BVWP).
The B 81 continues through the Harz Mountains. About 6 km beyond Blankenburg it passes through the small hamlet of Wendefurth. Below the Wendefurth Reservoir the B 81 crosses the Bode and continues on the Wendefurther Steige to the upper basin of the Wendefurth Power Station.
From its start in Magdeburg to the junction with the B 180 from Aschersleben the B 81 has been upgraded to four-lanes. Only a roughly 5.5 kilometre long section to Egeln is still two lanes. Currently this section is being upgraded to four. In the remaining stretch, the ring roads around Kroppenstedt and Gröningen have two lanes. The bypasses around Halberstadt and Blankenburg are a high priority in the current Federal Transport Infrastructure Plan. Currently it is in the planning phase. The ring road around Hasselfelde is a further requirement.
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