Speed limits in Germany
In 1973, in the wake of the 1973 oil crisis, a federal speed limit of 100 km/h (62 mph) on Autobahns was imposed to help conserve fuel for fear of impending future shortages (not for environmental or safety reasons). The measure only lasted from December 1973 to March 1974; while the administration and the Bundestag were in favor of keeping the speed limit, the Bundesrat pushed to repeal the law. As a compromise, a "recommended speed" was introduced on Autobahns and "highways outside of built-up areas with a center divide or without a center divide and a continuous lane for overtaking in both directions". This law is basically still in effect today. Unrestricted non-Autobahn highways, however, have since become virtually non-existent or replaced by "Schnellstraßen", Autobahn-like expressways typically limited to 120 or 130 km/h and normally only covering a few kilometers.
Bundesautobahn 99
The Aubinger Tunnel is Bavaria's longest motorway tunnel with its 1956 meters. It has been honored by the ADAC as one of the safest tunnels. The tunnel also has one of the most modern speed control systems in Europe. The measurements have been made in both directions since the beginning of March 2008, without the drivers noticing. Every 500 meters after the entrance, measuring points are set up in both directions, which forward the measured data directly to the police. In the first week after its launch, more than 1,500 speeding violations have been registered, according to press releases.