A steering system for a road vehicle; the steering system comprises: a steering wheel provided with an outer ring, which is mounted so as to rotate around a rotation axis and has no connection to steering wheels; a position sensor, which is designed to detect the angular position of the outer ring of the steering wheel around the rotation axis; and a mechanical limit stop device, which is coupled to the outer ring of the steering wheel and limits, in both directions, the maximum angular width of the rotation of the steering wheel around the rotation axis, so that the steering wheel can make, on the whole, a rotation around the rotation axis that is greater than 360°.