The present COVADIS data standard concerns the Great Traffic Routes network (including approximately 44.000 km of roads). “High-traffic roads, regardless of their state ownership, are roads which ensure the continuity of the main routes and, in particular, the diversion of traffic, the movement of exceptional transport, convoys and military transport and the economic services of the territory, and, as such, justify special rules on traffic police” (cf. Article 22 of Law No 2004-809 of 13 August 2004).
The list of RGC routes (defined in Article L. 110-3 of the Highway Code) is established by a decree in the OJ. The RGC roads are:
the national roads defined in article L. 123-1 of the Highways Code and referred to by the Decree of 5 December 2005 referred to above;
the roads listed in the annex to the decree;
the shoulder straps connecting either two sections of highways with high traffic, or a section of the highway with high traffic and one motorway.
Membership of the RGC network imposes constraints on managers “Community and groupings owning roads classified as high-traffic roads shall communicate to the State representative in the department, prior to their implementation, plans to modify the technical characteristics of these lanes and any measures likely to render such roads unsuitable for their intended purpose.”
The RGC also appears in the Urban Planning Code (Article L111-1-4): ‘Outside the urbanised areas of the municipalities, constructions or installations shall be prohibited in a strip of 100 metres on either side of the axis of motorways, express roads and diversions within the meaning of the Highway Code and seventy-five metres on either side of the axis of other roads classified as high traffic....’
The RGC network can thus be seen as a representation of the French main network defined according to the characteristics of the road infrastructure and its functional importance as well as its administrative status.
Although not part of the RGC network, motorways were treated in a similar manner to complement the grid. For ease of reading, the acronym RGC used in the rest of this document brings together all sections of the high-traffic network AND highways.
The RGC is available in two versions:
— a complete version that incorporates all sections of road component (including all shoulder straps) for farms at departmental or sub-departmental level. This version is used to derive the decree. This version concerns both the metropolitan departments and the DOM-TOMs.
— a simplified version, automatically derived from the full version for farms at regional or national level. This version concerns only the metropolitan departments. In both versions, each section is characterised by the RGC criterion which motivated its selection (exceptional transport, load-loading route, EDF, army, economic services,...) or its membership in the motorway network. The full version also includes all the criteria for which a section is selected. The standard also includes the historical follow-up of amendments to the GCR as well as the list of Orders in Council.
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