Vehicle dynamics data collection to characterize the drivers' behavior

45th European Transport Conference, Barcelone, ESPAGNE, 04-/10/2017 - 06/10/2017; The availability of data provided by in-board recorders is a great opportunity to acquire knowledge on drivers' behavior. The objective of this paper is to show how additional data synthesizing the dynamic solicitations of the vehicle during the travels, based on the concept of the friction circle, help to characterize the behavior of the driver-vehicle couple. An experiment with 51 cars of public fleets equipped with a specific Event Data Recorder (EDR) was carried out in three regions of France during one year. 221 drivers were volunteers to take part to the experiment and 154 of them agreed to authenticate themselves with a badge associated to the following driver's profile: age, year of driving license and gender. The EDRs recorded continuously data on driving behavior and manoeuvers performed by the vehicles as well as GPS trajectories. Data were used to detect critical driving situations called incidents (e.g. near-crash situation) but also to derive dynamic 'syntheses' of all the travels. These syntheses aggregate the time spent in every longitudinal and lateral accelerations combination, with 0.1 g intervals, and they can be cumulated for several travels. 2D and 3D graphical representations of these dynamic parameters give a good estimation of the real use of the car by the drivers.