In Germany, there is no general speed limit on motorways or autobahns, but there are recommended speed limits and some areas with speed limits. The German government recommends a maximum speed of 130 km/h (about 80 mph) on autobahns, but drivers are free to go as fast as they want in unrestricted sections of the autobahns. However, in reality, around 50% of the autobahn network is subject to a speed limit, mostly around towns, narrow sections, and otherwise dangerous areas. The advisory speed limit of 130 km/h is not binding unless indicated otherwise. Circular white signs with four black diagonal lines mark areas where there are no speed limits. Around 30% of the autobahn’s 8000-plus mile roads come with a permanent or variable speed limit, with a further 10% using traffic control systems to regulate traffic. The minimum speed for the fast lane is 110 km/h, middle lane is 90 km/h, and slow lane is 60 km/h. If a car cannot maintain these speeds on flat ground, then they are not allowed on motorways in Germany. For cars and motorbikes, the speed limit in towns and cities is 50 km/h (~31 mph) unless otherwise stated, and 100 km/h (~62 mph) on non-urban/open roads that are not the motorway/autobahn. For vehicles with a GVWR over 3,500 kg (7,716 lbs) and for vehicles with trailers, there is a general speed limit of 80 km/h (50 mph) .