http://en.wikipedia.org/wiki/Highway_patrol
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In France, the National Gendarmerie (French: Gendarmerie nationale) is a military force in charge of public safety, with police duties among the civilian population. It is also a military police / provost force. It has a strength of more than 105,975 persons (in 2007). The Gendarmerie works with the other national law enforcement agency, the police nationale.
http://en.wikipedia.org/wiki/Gendarmerie_Nationale_(France)