Length of roads, specially designed and built for motor traffic, which do not serve properties bordering on it, and which:
a) Are provided, except at special points or temporarily, with separate carriageways for traffic in two directions, separated from each other, either by a dividing strip not intended for traffic, or exceptionally by other means;
b) Have no crossings at the same level with any road, railway or tramway track, or footpath;
c) Are especially sign-posted as a motorway and is reserved for specific categories of road motor vehicles.
Entry and exit lanes of motorways are included irrespective of the location of the sign-posts. Urban motorways are also included. If one of the directions of a carriageway is longer than the other then the length is calculated as the sum of half of the distances of each direction of the carriageway from first entry point to last exit point.