Road Routes
As of 1998, a new road classification was introduced, which allocates the trunk road network into three categories.
The following definitions are given by the Danida report, "Evaluation Ghana" (Annex VI, p.6).
National Roads (“N” roads), linking the national capital with regional capitals. Also the roads of strategic importance such as main arterial roads to neighbouring countries. These national roads are provided with asphaltic concrete surfacing or bituminous surface treatment depending on traffic levels.
Inter-Regional Roads (“IR” roads) that are defined as the roads of inter-regional importance to provide regional coherence.
Regional Roads (“R” roads) that link district capitals to their respective regional capitals, other nearest district capitals and major industrial, trade or tourist centres.
Sources:
Netherlands Economic Institute, Danida, "Evaluation Ghana - Joint Evaluation of the Road Sub-Sector Programme 1996-2000", Ref. No. 104.A.1.e.24, November 2000, available from OECD
Ghana Road Network: https://en.wikipedia.org/wiki/Ghana_Road_Network
R.Neequaye, Road Link Map