This paper describes the preliminary results of a study concerning the impact of MMX technology in the field of automatic vehicle guidance. Due to the high speed a vehicle can reach (120~km/h), this application field requires a very precise real-time response. After a brief description of the ARGO autonomous vehicle, the paper focuses on the requirements of this kind of application: the use of only visual information, the use of low-cost hardware, and the need for real-time processing. The paper then presents the way these problems have been solved using MMX technology and discusses some optimization techniques that have been successfully employed.