The RATP (Régie autonome des transports Parisiens) is responsible for operating part of the public transport network in the Greater Paris area. In 2010, it transported around 3 billion passengers.

The RATP group was created on January 1st 1949.

RATP mainly operates Metros and Buses in Paris. They also operate the trams in Paris.

https://en.wikipedia.org/wiki/RATP_Group#Bus_and_coach

https://www.ratp.fr/

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