> 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-open-roads/os-open-roads-technical-specification/code-lists-and-enumerations/formofwayvalue.md). # FormOfWayValue The RoadLink feature is attributed with a *formOfWay* with a data type of *FormOfWayValue*. The following table lists the codes which are used to populate this field and gives a description for each code. ## **Code List: FormOfWayValue** | 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 either 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 link that provides exit from or entry to another link. | | Roundabout | A method of controlling traffic flow by allowing vehicles from a particular direction priority. | | Collapsed Dual Carriageway | The geometry of the dual carriageway has collapsed; this occurs where they run parallel and are less than a defined distance apart, resulting in a single line representing both carriageways of a dual carriageway. | | 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 there is a raised kerb with a track along which small wheels protruding from the sides of the modified vehicle run. This classification is only for 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 also provide some access for certain types of vehicles. | --- # 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 by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-open-roads/os-open-roads-technical-specification/code-lists-and-enumerations/formofwayvalue.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.