Abstract.Computer Vision can provide a great deal of assistance to Intelligent Vehicles. In this paper an Advanced Driver Assistance Systems for Vehicle Detection is presen ted. A ge ometric model of th e vehicle is defin ed where its energy function in cludes infor mation of the shape and symmetry of the vehicle and the shadow it produces. A genetic algorithm finds the optimum parameter values. As the algorithm receiv es info rmation from a road detection modul e some geometric restrictions can be applied. A multi-resolution approach is used to speed up th e algorithm and w ork in re altime. Examples of re al im ages ar e shown to validate the algorithm.