Description: State Highway Carriageway shows the surface polygon of the state highway and is maintained by HNO RAMM. The carriageway table presents core attributes about the state highways, such as: The State Highway name Reference station Length of each carriageway along with:Start and end displacements from the start of the road The road ID and carriageway ID The maintenance area and sub area the road is managed within Type of pavement and usage Class, Hierarchy and Classification of road Number of lanes and width of lanes Area of bus bays, road reserve, intersections and traffic islands Ownership and who maintains the road Performance of the highway in terms of traffic volumes, including heavy vehicles Roughness value Travel direction Seasonal correction zone Whether road is declared motorway or expressway The data is maintained as and when required by NZTA staff in the National Office, Regional offices and also by NZTA suppliers. Some data is known to be inaccurate, such as lane widths or number of lanes, so discretion is advised.