[HOT] Fwd: Re: New Job for Tracing in the Congo

[Eric SIBERT]

In Madagascar, there is also a governmental road classification.

http://wiki.openstreetmap.org/wiki/FR:WikiProject_Madagascar#Hi.C3.A9rarchisation

http://www.lalana.org/documents/reglementations/routes/decret_99_976%20RN.pdf

National Roads are divided in three groups:
- primary : joining provincial prefecture
- secondary
- tertiary and/or temporary (maintained by regional authorities)

General recommendations for OSM are :
- more secondary than primary
- more tertiary than secondary
- unclassified+residential : more than 50% of the roads

At this point, in Africa, you face a first problem: where is the limit 
between roads and tracks?

 From malagasy government :
- primary : 2560 km
- secondary : 4630 km
- tertiary : 4550 km

Total including regional and local.. roads : 38 000 km.

My first idea was to use the governmental classification. But the ratio 
between secondary and tertiary was not good. So my suggestion is to add 
the roads going to the main village of each "commune" from the national 
network. I don't have any idea on how much the length is. But with 5000 
km, this would fulfill all the conditions mentioned above.

All of this don't tell where are the roads. So, I spent a lot of time 
crowdsourcing to find the locations of the roads. With Bing and the help 
of several contributors, it was possible to draw must of them.

Now, back to RDC.

Routes Nationales (19 605,73 km soit 35,5% du RRIG)
Routes Prov. prioritaires (19 715,18 km soit 35,7% du RRIG)
Routes Prov. secondaires (15 918,28 km soit 28,8 % du RRIG)

The first idea would be to use them as primary, secondary and tertiary 
respectively. But the ratios are not good. Are national roads really 
better than provincial ones? Are some national roads more important? The 
ones part of "Corridors Régionaux"? Any data or local knowledges are 
welcome.


Éric