1. A process for the automatic determination of a current speed limitation on a road that is being used, or about to be used, by a motor vehicle, comprising the following steps: establishing, by means of a first system, known as the navigation system, which involves notably a data receiver from a geographical positioning system together with cartographical data, a likely speed limitation associated with a first confidence index; generating a first set of information comprising at least the likely speed limitation and the first confidence index; establishing, by means of a second system, known as the image processing system, which involves notably the use of a camera and image processing applications capable of identifying and interpreting speed limitation panels arranged in the vicinity of the road, a probable speed limitation associated with a second confidence index; generating a second set of information comprising at least the probable speed limitation and the second confidence index; and determining the current speed limitation on the road in question, on the basis of the first set of information and the second set of information and taking into consideration the first confidence index and the second confidence index; wherein said first confidence index is calculated using a first plurality of criteria of information that is weighted in relation to a confidence of their associated information.