Classification of the national road network

The axes that make up the national road network can be classified into four categories:
- motorways,
- national roads (or RN),
- motorway ramps,
- the national road shoulder harnesses

Each section of road is defined by:
- its name (road)
- its length
- its starting (D) and ending (F) coordinates expressed in coordinates (X, Y, Z) or by a road marking system composed of 4 attributes:
- pr = Road reference point
- depPr = department where the PR is located
- concessionPr = indicates whether the PR is on a conceded section (C) or not (N)
- abs = abscissa or distance (in metres) between the point of the RP to which it relates
- its classification according to one of the 4 categories defined above