> 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-fundamentals/os-mastermap-highways-network-code-lists/structuretypevalue.md). # StructureTypeValue This code list is present in the OS MasterMap Highways Network – RAMI product. The Structure and RestrictionForVehicles Feature Types have the property ‘structure’, which has the type StructureTypeValue. The following table identifies the codes used to populate this field. ## **Code List: StructureTypeValue** {% embed url="" %} | Code | Description | | --------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- | | Barrier | A barrier that can be moved horizontally or vertically to allow access. | | Bridge Over Road | The representation of a bridge or structure. | | Bridge Under Road | The representation of a bridge passing over an obstruction that is not another road. | | Gate | A moveable barrier, hinged at one end, that moves through the horizontal plane to control access. | | Level Crossing On Route Fully Barriered | A railway intersects with the road network and rail or road vehicles are controlled by warning signs, lights and fully gated barriers. | | Level Crossing On Route Part Barriered | A railway intersects with the road network and rail or road vehicles are controlled by warning signs, lights and part gated barriers. | | Level Crossing On Route Unbarriered | A railway intersects with the road network and rail or road vehicles are controlled by warning signs, lights and no gated barriers. | | Moveable Barrier | A barrier that can be moved horizontally or vertically to allow access. | | Pedestrian Crossing | A place dedicated to pedestrians to cross the road. | | Rising Bollards | A bollard that that can be retracted/hinged to allow access. | | Structure | A structure over the road. | | Toll Indicator | An indication that there is a charge payable to use the highway. | | Traffic Calming | A physical feature on the road surface designed to slow down the flow of traffic. | | Tunnel | A road which passes underground or water. | --- # 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-fundamentals/os-mastermap-highways-network-code-lists/structuretypevalue.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.