Please post comments / your views if you disagree below.This seem to be the current standard: viewtopic.php?f=141&t=3466&start=10#p26947 refer to it primarily.
This was my suggestion and it seem to differ in some places. (Major highway vs freeway in may cases)
In some cases it might make sense to classify parts of roads as a different type for consistancy (e.g. the R21 between the Hans Strijdom offramp and the fountains circle - keeping it freeway, rather than major highway might make the map easier to read)
Something that should eventually become a wiki page as well (like road naming)...
We should probably agree on the road types used....
The main types are: (and what I think should be classified under those)Freeway
Speed restriction of between 80 and 120 (mostly 120)
Any piece of road without junctions and traffic lights, with a speed restriction of mostly 120 km/h
Default level for N roads.
All roads marked with signs GDS-4 and GDS-5
(see "Promotion" in zarf's post)Examples
In Gauteng: M1 (most / all?), N1, N14 between Krugersdorp and Eeufees offramp, most of the R21 between Boksburg and Pretoria, N4 between hartbeespoort and Witbank
Large parts of the N1 (around Kroonstad, Bloemfontein)Major Highway
Speed restriction of between 80 and 120 (mostly 100 / 120)
Default level for Rxx roads
Large parts of M-roads might also be classified here (NOT parts going through town at 60)Minor Highway
Speed restriction of between 80 and 120 (mostly 100 / 120) (and possibly slower for short distances)
Most roads between towns
Default level for R100-R999Ramp
Ramp onto / off / between highways / freewaysPrimary street
Must be in populated area - otherwise probably Minor highway
Speed limit typically 60 - 80
Anything with a route number (probably M) assigned and not classified above
Roads running through small towns
Main streets of towns
Most dual-carriagways in townStreet
Smaller roads in town
Roads in office parks / estates / complexes (complexes might debatable, possibly private roads)
Roads in enclosed neigbourhoodsService road
Long access roads to houses / bussinessesDirt / 4x4 road
Any dirt road, even a major one (4x4 trails should be separate and the surface should be a property of the road) (Several dirt roads should be minor highways in South Africa)Parking lot road
Roads in parking lots. For roads within limited-access company parking, private road might want to be used(Unedited road)
Roads recorded and not edited. Nothing added to this manually<edit>26 Sept: updated freeway definition to more closely match that in previous thread</edit>