Abstract: System which comprises a plurality of devices for acquiring (1) identifiers of transmitter devices (2) by means of radio frequency in the 2.4 GHz band, these acquisition devices (1) being connected to a central management computer (3) for sending the captured identifiers of the transmitter devices (2) in form of tags (32) in order to include the latter in a database (31). The method comprises the stages of: —acquiring the identifier of the transmitter devices (2) at particular points; —extracting the exclusive part; —encrypting said exclusive part in a tag (32); —sending the tag (32), acquisition point and time (33) to a database (31) of a central computer (3); —comparing the tag (32) and time (33) with the previously stored data in the database (31).

Abstract: The invention relates to a sensor module 1 for embedding in street A, comprising an outer housing (casing, box) 2 fitted with a lid 3 in the housing of which there is at least one sensor 4 of presence or arrival/departure of vehicles, characterized by the fact that it is comprised of a second box 6 arranged inside the first housing 2 and attached to the lid 3 and inside which is the sensor 4, so as to obtain a module made of two parts, one that remains in the ground and one that is easily removed, removing it at the same time or the sensors with associated electronics. The invention also relates to a system using a plurality of sensor modules as this, in communication with each other.