| Code | Description |
|---|---|
Single Carriageway
A road consisting of one carriageway with traffic in one or both directions. There may be more than one lane in any particular direction.
Dual Carriageway
A road consisting of two separate carriageways with separate flow directions. The carriageways are partitioned by physical features, such as a barrier and/or verge.
Slip Road
A road that provides exit from or entry to another road.
Roundabout
A method of controlling traffic flow by allowing vehicles from a particular direction priority.
Service Road
Road running parallel to and connecting to a road with a relatively high connectivity function, which is especially designed to enable access from the connecting roads to roads with a low connectivity function in its vicinity.
Enclosed Traffic Area
Area with no internal structure of legally defined driving directions. At least two roads are connected to the area, for example, a car park.
Traffic Island Link At Junction
Where an island that is over 8m² exists in the middle of a road on the approaches to a junction, the road link is split around it.
Traffic Island Link
Where an island that is over 8m² exists in the middle of a road, the road link is split around it.
Entrance Way
Link that provides entry to a site (e.g. Car Park, Hospital, Police Station or Ambulance Station).
Entrance Or Exit Way
Link that provides access in both directions (entry and exit) to a site (e.g. Car Park, Hospital, Police Station, or Ambulance Station).
Exit Way
Link that provides exit from a site (e.g. Car Park, Hospital, Police Station or Ambulance Station).
Layby
An area at the side of the road where vehicles can stop on an ad hoc basis usually for a short time.
Track
An unmade way for a vehicle.
Guided Busway
A specially constructed or modified route for passenger road vehicles that have been built or adapted to be steered by external means. Typically, along guided busways, a raised kerb acts upon small wheels protruding from the sides of the modified vehicle.
This classification is only for the specific cases where buses run along specifically designed tracks or channels that remove the need for steering.
Shared Use Carriageway
Roads that have been altered for use principally by pedestrians but may provide some access for certain types of vehicle.