FormOfWayTypeValue A road consisting of one carriageway with traffic in one or both directions. There may be more than one lane in any particular direction Single 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. Dual Carriageway A link that provides exit from or entry to another link. Slip Road A method of controlling traffic flow by allowing vehicles from a particular direction priority. Roundabout 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. Source: INSPIRE Service Road Area with no internal structure of legally defined driving directions. At least two roads are connected to the area. Enclosed Traffic Area Where an island that is over 8 m² exists in the middle of a road on the approaches to a junction, the road link is split around it. Traffic Island Link At Junction Where an island that is over 8 m² exists in the middle of a road, the road link is split around it Traffic Island Link 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. Guided Busway An area for the casual parking of vehicles either adjacent to the main carriageway or a widening of it. Layby An unmade way created by the passage of vehicles. Track Canal Path Roads that have been altered for use principally by pedestrians but may provide some access for certain types of vehicle. Shared Use Carriageway A structure that is built over a river, railway, road or ravine to permit the flow of pedestrians of cyclists. Footbridge Path A made area using a series of raised areas which links surfaces at different heights. Path With Steps Subway The geometry of the dual carriageway has been collapsed where they are running parallel and is less than a defined distance apart, resulting in a single line representing both carriageways of a dual carriageway. Collapsed Dual Carriageway Path With Level Crossing Path With Ford