Abstract: The object of the present invention is a rental vehicle fleet management system (V) that includes a server (S) connected (10) to a rental terminal (Bi), which manages a set of parking spaces (Pij), distinguished by the fact that the user carries a communicator (30) that contains an active UHF RFID transmitter (34), which communicates (DU) with the emitting terminals (Bi), and a UHF RFID transmitter that is concealed in the frame of the bicycle, which communicates (DV) with the rental terminals (Bi) or the parking space locking/unlocking systems (Pij).