some of those located in Eastern Germany). Most unlimited sections of the autobahn are located outside densely populated areas. Vehicles with a top speed less than (such as quads, low-end microcars, and agricultural/construction equipment) are not allowed to use the autobahn, nor are motorcycles and scooters with low engine capacity regardless of top speed (mainly applicable to mopeds which are typically limited to or anyway). To comply with this limit, heavy-duty trucks in Germany (e.g. mobile cranes, tank transporters etc.) often have a maximum design speed of (usually denoted by a round black-on-white sign with "62" on it), along with flashing orange beacons to warn approaching cars that they are travelling slowly. There is no general minimum speed but drivers are not allowed to drive at an unnecessarily low speed as this would lead to significant traffic disturbance and an increased collision risk. Public debate German national speed limits have a historical association with war-time restrictions and deprivations, the Nazi era, and the Soviet era in East Germany. After the Nazi dictatorship, German society was happy to overcome the traumas of war by freeing itself from most government restrictions, prohibitions and regulations. "Free driving for free citizens" ("freie Fahrt für freie Bürger"), a slogan promoted by the German Auto Club since the 1970s, is a popular slogan among those opposing autobahn speed restrictions. Tarek Al-Wazir, head of the Green Party in Hesse, and currently the Hessian Transport Minister has stated that "the speed limit in Germany has a similar status as the right to bear arms in the American debate. At some point, a speed limit will become reality here, and soon we will not be able to remember the time before. It's like the smoking ban in restaurants." Early history The Weimar Republic had no federally required speed limits. The first crossroads-free road for motorized vehicles only, now A 555 between Bonn and Cologne, had a limit when it opened in 1932. In October 1939, the Nazis instituted the first national maximum speed limit, throttling speeds to in order to conserve gasoline for the war effort. After the war, the four Allied occupation zones established their own speed limits until the divided East German and West German republics were constituted in 1949; initially, the Nazi speed limits were restored in both East and West Germany. After the World Wars In December 1952 the West German legislature voted to abolish