| Country: | DEU |
| Type: | A |
| Route: | 71 |
| Map: | Map D A71.svg |
| Length Km: | 220 |
| Terminus A: | Sangerhausen |
| Cities: | Artern Heldrungen Kölleda Sömmerda Erfurt Arnstadt Ilmenau Geraberg Oberhof Zella-Mehlis Suhl Meiningen Mellrichstadt Bad Neustadt Münnerstadt Bad Kissingen |
| Terminus B: | A 70 near Schweinfurt |
| States: | Saxony-Anhalt, Thuringia, Bavaria |
| Previous Type: | A |
| Previous Route: | 70 |
| Next Type: | A |
| Next Route: | 72 |
is an Autobahn in Germany. It connects the A 38 and Erfurt to the A 70 near Schweinfurt. A further northern extension to the A 14 near Plötzkau has been proposed by the state government of Sachsen-Anhalt.[1]
Construction on the A 71, supervised by DEGES, began in 1996, most parts were being opened by December 2005. The project was completed in September 2015. The section through the Thuringian Forest was the most expensive road ever built in Germany with an average cost of 10e6$/km. This section includes the Rennsteig Tunnel which is the longest road tunnel in Germany at 8km (05miles) and is called "Thüringer wald Autobahn" (Thuringian Forest Motorway).
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While crossing the Thuringian Forest are a lot of large engineering works needed, the most notable are listed in the table below.
| km | mi | building | length | max. height | |
|---|---|---|---|---|---|
| 92,5 | 925km (575miles) | Behringen Tunnel | |||
| 94,0 | 940km (580miles) | Wipfra viaduct | |||
| 101,5 | 1015km (631miles) | Altwipfergrund viaduct | |||
| 102,5 | 1025km (637miles) | Streichgrund viaduct | |||
| 107,0 | 1070km (670miles) | Reichenbach viaduct | |||
| 108,5 | 1085km (674miles) | Zahme Gera viaduct | |||
| 112,0 | 1120km (700miles) | Alte Burg Tunnel | |||
| 113,5 | 1135km (705miles) | Schwarzbachtal viaduct | |||
| 114,0 | 1140km (710miles) | Wilde Gera viaduct | |||
| 114,5 | 1145km (711miles) | Rennsteig Tunnel | |||
| 123,5 | 1235km (767miles) | Hochwald Tunnel | |||
| 126,0 | 1260km (780miles) | Steinatal viaduct | |||
| 126,5 | 1265km (786miles) | Berg Bock Tunnel | |||
| 131,0 | 1310km (810miles) | Albrechtsgraben viaduct | |||
| 133,5 | 1335km (830miles) | Seßlestal viaduct | |||
| 135,0 | 1350km (840miles) | Schafstalgrund viaduct | |||
| 137,0 | 1370km (850miles) | Streitschlag viaduct | |||
| 140,0 | 1400km (900miles) | Schwarza viaduct | |||
| 142,0 | 1420km (880miles) | Rotes Tal viaduct | |||
| 144,0 | 1440km (900miles) | Schindgraben viaduct (stone quarry) | |||
| 145,0 | 1450km (900miles) | Judental viaduct | |||
| 147,0 | 1470km (910miles) | Haseltal viaduct | |||
| 149,8 | 1498km (931miles) | Werratal viaduct | |||
| 152,5 | 1525km (948miles) | Eichelberg Tunnel | |||
| 153,5 | 1535km (954miles) | Jüchsen viaduct |