Despite the widespread belief of complete freedom from speed limits (and a lobbying effort that has the same influence and deep pockets as the American gun lobby), some speed regulations can be found on the Autobahns. Many sections do indeed have permanent or dynamic speed limits ranging from 80 to 130 km/h (50-80 mph), particularly those with dangerous curves, in urban areas, near major interchanges, or with unusually constant heavy traffic. In construction zones, the limit may be as low as 60 km/h (37 mph). Also, some sections now feature nighttime and wet-weather speed restrictions, and trucks are always regulated (see table below). Still, about two-thirds of the Autobahn network has no speed permanent limit, although there is always an advisory speed limit of 130 km/h (81 mph). This recommendation is generally seen for what it is - an attempt by the government to cover itself without having to upset millions of Porsche and BMW owners (AKA voters). However, if you exceed the advisory limit and are involved in an accident, you could be responsible for some of the damage costs even if you are not at fault.
Maximum speed limits for different kinds of vehicles
Some vehicles may be exempted from the 80 km/h limit above. A decal resembling a speed limit sign displayed on the back of a vehicle indicates that it is exempt from the general limit and may travel the speed indicated on the label, usually 100 km/h.
Over 3, 200 km of Autobahn now feature dynamic speed limits which are adjusted to respond to traffic, weather, and road conditions. These speed limits and conditions are indicated using a rather elaborate system of electronic signs (see below).