Autobahnpolizei  Although the autobahns are federal roads, the "Autobahnpolizei" are always part of the state police ("Landespolizei" in Germany). In Switzerland, the state police ("Kantonspolizei") is responsible for highway patrols as well. "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" 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 permanent speed limit of or less, primarily in urban areas. On the remainder, the 130 km/h speed limit is only advisory.