Member States may limit the amount of fuel exempt on admission in the case of:

1. (a)

   commercial motor vehicles engaged in international transport coming from third countries or third territories to their frontier zone, to a maximum depth of 25 kilometres as the crow flies, where such transport consists of journeys made by persons residing in that zone;

2. (b)

   private motor vehicles belonging to persons residing in the frontier zone, to a maximum depth of 15 km as the crow flies, contiguous with a third country or third territory.