Can you or one of your experts tell me what the ‘C-D’ stands for in the sign name below? I see that abbreviation is used in several direction signs.
C-D in SARTSM stands for collector-distributor and is a road classification. A collector-distributor road is normally found at a systems interchange (where two freeways intersect) and is parallel to but off the freeway through lanes. It is also found where interchange spacing will be sub-standard if direct access is given and in such cases access is provided off the C-D road e.g C-D road along N1 eastbound past Century City in Cape Town.
Attached section from SARTSM Vol.1 refers to such collector-distributor roads.
The term is of importance for freeway road sign designers and not necessary for drivers to know.
Schalk Carstens Pr Eng
Chief Engineer: Traffic Engineering
Chief Directorate Road Network Management
Provincial Roads and Transport Management Branch
Department of Transport and Public Works
WESTERN CAPE GOVERNMENT