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Autobahnpolizei is the term in Germany, Austria and the German-speaking parts of Switzerland for the highway patrol. Heavy traffic and high-speed accidents resulted in the creation of special police units to patrol the expressways known as Autobahnen.
Although the autobahns are federal roads, the Autobahnpolizei are always part of the state police (Landespolizei in Germany or Kantonspolizei in Switzerland).
Autobahnpolizei officers facilitate and regulate the flow of traffic, help motorists whose vehicles have broken down on the Autobahn and rapidly respond to accidents. Vehicle safety checks and crime prevention at rest stops are also part of the Autobahnpolizei’s duties.
Investigation sections probe crime at rest stops and the movement of criminals and smugglers on the Autobahn, often together with German Customs. The Autobahnpolizei also use fast unmarked vehicles with video cameras discreetly mounted front and back to follow and film reckless drivers and speeders. Approximately 30% of autobahns in Germany have a compulsory and permanent speed limit of 130km/h or less, primarily in urban areas. On the remainder, the 130km/h speed limit is only advisory.
See also 
- Polizei.de (German)