Autobahns of Austria
Unlike German autobahns, on Austrian autobahns a general speed limit of 130 km/h (81 mph) is set, although as of August 25, 2018, the FPÖ government has been going on a trial for a possible speed limit increase to 140 km/h (87 mph) on the Autobahn 1 freeway. They may only be used by powered vehicles that are designed to achieve at least . While on the motorway voluntary stops, U-turns and backward driving are prohibited.
Speed limits in Germany
Legally, however, state and even local authorities have the power to enact speed limits. The district of Köln / (Cologne) has posted a speed limit on the heavily frequented Kölner Autobahnring / (Cologne Beltway). Effective 9 April 2008, the City-State of Bremen began enforcing a general 120 km/h (75 mph) speed limit, citing environmental concerns. However, Bremen's new limit only impacted an additional 11 kilometers of Bremen's 60 kilometers of Autobahn; most Bremen motorways already had some speed restriction due to congestion and noise.