Hitler's 70km phantom motorway, Germany's longest autobahn ruin

Route 46 is Germany’s longest abandoned motorway project. It owes less to transport efficiency than to Nazi-era construction ideology and propaganda.

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TL;DRAI

Route 46, Germany's 70km motorway begun in 1937, halted in 1939 due to WWII and never resumed because of technical flaws—narrow gauge, steep gradients. Germany built the modern A7 instead, illustrating how pivoting from poorly-designed infrastructure beats sunk-cost persistence.

337 words~2 min read

By Diana Resnik

Published on

07/06/2026 - 13:36 GMT+2

Route 46 is 70 kilometres long and is considered Germany’s longest officially registered motorway ruin. Today it is nothing more than a relic, recalling a major project from the Nazi era that was launched shortly before the Second World War and never completed.

The motorway runs between Bad Hersfeld and Würzburg. The route is shaped less by considerations of efficiency than by Nazi construction ideology and propaganda. It was intended to showcase to drivers the beauty of the German homeland. Scenic highlights were to include, for example, the Homburg castle ruins.

Hitler's 70km phantom motorway, Germany's longest autobahn ruin

Hitler's 70km phantom motorway, Germany's longest autobahn ruin

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