Table 2 Road types considered for this work, based on OpenStreetMap definitions
This work classification | aOSM classification | OSM definition |
|---|---|---|
Type 1 | Primary | A major highway linking large towns |
Primary link | Slip roads/ramps and "channelised" at-grade turning lanes that connect through carriageways/through lanes of a Primary to other minor roadways | |
Secondary | A highway that is not part of a major route, but forms a link in the national network | |
Secondary link | Used to identify slip roads/ramps and "channelised" at-grade turning lanes connecting the through carriageways/through lanes of a Secondary other minor roadways | |
Tertiary | Roads connecting smaller settlements, and within large settlements for roads connecting local centers. In terms of the transportation network, OpenStreetMap "tertiary" roads commonly also connect minor streets to more major roads | |
Unclassified | Minor public roads typically at the lowest level of the interconnecting grid network | |
Type 2 | Residential | Roads for accessing residential areas and in residential areas but not normally used as through routes |
Service | Roads for access to a building, service station, beach, campsite, industrial estate, business park, etc | |
Track | Roads mostly for agricultural use, forest tracks etc. Often unpaved (unsealed) but may be paved tracks Suitable for two-track vehicles, such as tractors or jeeps |