ARGO is a Lancia Thema passenger car equipped with a vision-based system that allows to extract road and environmental information for the automatic driving of the vehicle. By means of stereo vision, obstacles on the road are detected and localized, while the processing of a single monocular image allows to extract the road geometry in front of the vehicle and the position of the preceding vehicle. The system has been tested with a 6-days 2000-km long trip coverer in automatic mode.