Probably the most famous sign for Autobahn fans is the &quot;End of restrictions&quot; sign:<p><a href="https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;thumb&#x2F;0&#x2F;03&#x2F;Zeichen_282.svg&#x2F;2000px-Zeichen_282.svg.png" rel="nofollow">https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;thumb&#x2F;0&#x2F;03&#x2F;Ze...</a><p>It&#x27;s abstract in the extreme.  You have to know what it means via a prior learning process, as there&#x27;s no relationship with an everyday activity.  For my US driver&#x27;s license I had to learn maybe 50 signs, and they were easy to categorize based on shape and color (white rectangles are a restriction such as speed limits).  For my European driver&#x27;s test (for USAFE) it was over 200 different signs, and each had to be learned individually as they seldom had commonalities.<p>The &quot;Autobahn begins&quot; sign is fairly intuitive, though:<p><a href="https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;thumb&#x2F;2&#x2F;27&#x2F;Road_sign_autobahn_330.svg&#x2F;612px-Road_sign_autobahn_330.svg.png" rel="nofollow">https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;thumb&#x2F;2&#x2F;27&#x2F;Ro...</a>