> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-roads/os-mastermap-highways-network-roads-technical-specification/feature-types/roadjunction.md). # RoadJunction A RoadJunction feature is a collection of RoadNode features that share the same road junction name or number. The collection of RoadNodes will include all RoadNodes that constitute part of a “slip road” or other link between two or more crossing road features. A RoadNode could be referenced by multiple RoadJuntion features. Motorway Junctions will be populated completely, other junctions are being supplied as data is improved for future releases. Highlighted red for clarification only.
Diagram of collection of RoadNodes making up a road junction (highlighted red).

Collection of RoadNodes making up a road junction (highlighted red). RoadLinks representing the slip road are

The context diagram below shows how the RoadJunction feature relates back to the Network Elements.
Context diagram for the RoadJunction showing its relationship with other roads INSPIRE feature types

Context diagram for the RoadJunction feature type

## RoadJunction Attributes A compound feature that represents a road junction with a name or number. ### id Unique identifier, for RoadJunction this is a TOID * **Attribute name:** gml\_id (GML), toid (GeoPackage), Not provided (VectorTiles) * **Type:** CharacterString * **Size:** 20 * **Multiplicity:** \[1] ### identifier Uniform Resource Identifier * **Attribute name:** identifier (GML), identifier (GeoPackage), Not provided (VectorTiles) * **Type:** CharacterString * **Size:** 37 * **Multiplicity:** \[1] ### inspireId INSPIRE External object identifier of the spatial object. * **Attribute name:** inspireId * **Type:** Identifier * **Multiplicity:** \[0..1] ### beginLifespanVersion «lifeCycleInfo» «voidable» INSPIRE Date and time at which this version of the spatial object was inserted or changed in the spatial data set. Note: The time part is always set to zero. * **Attribute name:** beginLifespanVersion (GML), begin\_lifespan\_version (GeoPackage), Not provided (VectorTiles) * **Type:** DateTime * **Multiplicity:** \[1] ### reasonForChange The reason for a change made to a feature. * **Attribute name:** reasonForChange (GML), reason\_for\_change (GeoPackage), Not provided (VectorTiles) * **Type:** [ChangeValue](/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-code-lists/changevalue.md) * **Size:** 32 * **Multiplicity:** \[1] ### junctionType A classification for the Road Junction. * **Attribute name:** junctionType (GML), junction\_type (GeoPackage), Not provided (VectorTiles) * **Type:** [JunctionTypeValue](/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-code-lists/junctiontypevalue.md) * **Size:** 26 * **Multiplicity:** \[1] ### junctionName The name of the junction. For numbered junctions, this will provide a description of the junction, for example, M6 Junction 6. Note: Where a feature has more than one name, the language of each name is provided as a 3-digit ISO 639-2 code (‘eng’, ‘cym’, ‘gla’). * **Attribute name:** junctionName (GML), junction\_name (GeoPackage), Not provided (VectorTiles) * **Type:** LocalisedCharacterString * **Size:** 120 * **Multiplicity:** \[1..2] ### roadClassificationNumber The official road number assigned by the appropriate authority. For example, M6. * **Attribute name:** roadClassificationNumber (GML), road\_classiffication\_number (GeoPackage), Not provided (VectorTiles) * **Type:** CharacterString * **Size:** 5 * **Multiplicity:** \[0..1] ### junctionNumber The number of the junction. For example, 6. * **Attribute name:**junctionNumber (GML), junction\_number (GeoPackage), Not provided (VectorTiles) * **Type:** CharacterString * **Size:** 3 * **Multiplicity:** \[0..1] ### node The reference to the RoadNode features which builds up the RoadJunction feature. * **Attribute name:** node (GML), node (GeoPackage), Not provided (VectorTiles) * **Size:** 20 * **Multiplicity:** \[1..\*] --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-roads/os-mastermap-highways-network-roads-technical-specification/feature-types/roadjunction.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.