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| Bundesstraße 243 | |
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| Route information | |
| Length | 113 km (70 mi) |
| Major junctions | |
| Northwest end | Hildesheim |
| Southeast end | Nordhausen |
| Location | |
| Country | Germany |
| States | Lower Saxony, Thuringia |
| Highway system | |
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The B 243 runs from Hildesheim over Seesen and Herzberg am Harz to Nordhausen.
The metalled artificial road (Chaussee) between Seesen and Osterode was built between 1785 and 1795 as an extension of the Frankfurt Road and known as the Thuringian Road (Thüringer Straße).
It was established as Reichsstraße 243 between Hildesheim and Nordhausen in 1937.
This federal road was interrupted by the division of Germany and was only opened again from end to end on 18 November 1989 when the border crossing between Nüxei and Mackenrode was installed.
 | This article contains a bulleted list or table of intersections which should be presented in a properly formatted junction table.(December 2021) |
Legend:
| km | Exit | Name |
|---|---|---|
 | Hildesheim  B 1 | |
| | Groß Düngen | |
 | Bad Salzdetfurth local diversion | |
| | Bockenem  B 243a | |
| | Rhüden  B 82 | |
| | Seesen local diversion  B 248 | |
| combined with B 248 | ||
 | Kraftfahrstraße | |
| combined with B 248 | ||
 | (67) | Seesen - with crossroads  A 7  E45 |
 | end of motor road | |
 | Engelade {{BAB-{{{3}}}|{{{4}}}|{{{5}}}}} | |
| |  B 64 | |
 | Ildehausen B 248 | |
| | Kraftfahrstraße | |
| | Kirchberg | |
| | Münchehof  B 242 | |
| combined with B 242 | ||
 | parking area | |
| | Münchehof-Süd B 242 | |
| | Gittelde-Nord   | |
| | Ziegenberg parking area | |
| | Gittelde-Süd | |
| | Osterode-Katzenstein | |
| | Osterode-Lasfelde | |
| | Lasfelde parking area | |
| | Osterode-Nord | |
 | Bridge over Osterode 1150 m | |
| | Osterode-Mitte  B 241 | |
| combined with B 241 | ||
| | Osterode-Süd B 241 | |
| | Osterode-Leege | |
| | Papenhöhe parking area | |
| | Aschenhütte | |
| | Herzberg am Harz-Nord | |
| | end of motor road | |
| | Herzberg am Harz  B 27 | |
| combined with B 27 | ||
| | Kraftfahrstraße | |
 |  | Services Herzberg-Ost |
| | parking area | |
| | Scharzfeld | |
| | Scharzfeld parking area | |
| | Hasenwinkel Valley Bridge 100 m | |
| | Barbis | |
| | Bad Lauterberg-West (2014) B 27 | |
| | Oder Valley Bridge 528 m (2014) | |
| | Bad Lauterberg-Süd (2014) | |
| | Winkel Valley Bridge 650 m (2014) | |
| | Steina (2014) | |
| | end of motor road | |
| | Nüxei | |
| | Mackenrode | |
| | Großwechsungen-Nord | |
| | Kraftfahrstraße | |
| | (9) | Großwechsungen  A 38 (2012) |
