Abstract: A surveillance system for traffic on a road includes a number of surveillance units. Each of the surveillance units is mounted at height, and includes at least one road traffic detection sensor. The surveillance units are placed along the road alternately on a first side and on a second side of the road. The surveillance system can be used in an associated surveillance method for traffic on a road.

Abstract: A method for acquiring data, in an electronic acquisition module, detected by a sensor embedded on a vehicle with a predefined trajectory, including the following operations implemented in real time by an electronic acquisition module including a database defining, for each of a plurality of points of the predefined trajectory, a set of subsections of interest indicating at least one subsection of interest in the acquisition zone of the sensor: determining a next position of the moving vehicle on the predefined trajectory of the moving vehicle, and determining, as a function of at least the subsection of interest defined by the database for the point corresponding to the determined position, the value of a parameter included among acquisition of the data by the embedded sensor in the next position, or a processing parameter of the data captured by the embedded sensor in the next position.