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Data on road surface type, condition and traffic volume were compiled by Africon Limited for the AICD study led by the World Bank. Data from the South African National Roads Agency (SANRAL) were reviewed and transport experts were consulted in an effort to derive estimates for all of the primary and secondary road network.
The following attributes were collected:
LINKNO: ID of the link ,
ROADNO: ID of the road ,
START_KM: Start of link (0)
END_KM: End of link LENGTHKM: Length of link (km) ,
STARTDESC: Name of the locality where the link starts ,
ENDDESC: Name of the locality where the link finishes ,
CLASS: World Bank functional classification ,
REGION: Name of the 1st level of administrative division (province) ,
WIDTH: Width of road (m) ,
LANES: Number of lanes ,
SURFTYPE: Classification of surface type (paved or unpaved) ,
CONDITION: Description of road condition ,
AADT: Estimated average annual daily traffic
Attribute values may be unknown (or value = 0) for any of the descriptive characteristics. |