Maintenance of the road network in acceptable use and safety conditions at all times or almost requires substantial means of intervention. Despite this, on various specific points of the road network (structures, highly loaded sections) winter maintenance remains problematic. From the standpoint of the safety of road users, IADs (automatic de-icing systems) can treat the floor at the appropriate time, that is to say just before the onset of the risk of loss of adhesion coating, which does not allow winter maintenance by conventional means. To reduce significantly the risk of loss of traction, the trucks by salting requires preventive applications. Now they are not recommended, see banned because of their impact on the environment. Using IAD s' is therefore not only wise for the safety of users, but also in economic terms, the guarantee of an optimal flow capacity for traffic, by reducing accident costs and a salting strictly limited to needs.