> 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-multi-modal-routing-network/os-mrn-technical-specification/code-lists/accessvalue.md). # AccessValue This code list is used in association with a number of attributes which are present within the Transport Link Feature Type. The code list describes the nature of the access permitted to the Transport Link. | Label | Definition | | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | yes | General public access is assumed, but does not imply an official, legally-enshrined right of way. | | no | General public access is prohibited. Stronger interdiction than private. E.g. a fully closed road; a restricted military facility. If only specific transport modes are forbidden, for example, at a vehicle no-entry sign, a more specific restriction like vehicle=no or motor\_vehicle=no will be used over the general key access. | | private | General public access is not allowed. Access is granted with individual permission only. E.g. A driveway with a no trespassing or keep out sign; A company parking lot for employees only. | | permissive | Open to general traffic until such time as the owner revokes the permission which they are legally allowed to do at any time in the future. | | permit | Open only to people who have obtained a permit granting them access. | | destination | Only when travelling to this element area; i.e. local traffic only. This is signed, for example, as 'except for access' in the UK. | | delivery | Only when delivering to the element. For example motor\_vehicle=delivery on a highway=pedestrian. | | customers | Only for customers of the element. | | designated | A preferred or designated route for the class of traffic specified by the tag key, such as foot=designated. In general this means that there is a (explicit) sign such as pedestrians allowed, or a pedestrian icon. | | use\_sidepath | Used to indicate that a mapped parallel way (that belongs to the same road) must be used instead. A road can legally consist of several ways, such as a single or dual carriageway with parallel tracks for cyclists, mopeds, pedestrians and/or equestrians. | | dismount | Permitted for some vehicle (or animal) only if you dismount. Mostly used for bicycle, for example bicycle=dismount which indicates people are not permitted to cycle but are allowed to dismount and bring the bike. | | agricultural | Only for agricultural traffic. | | forestry | Only for forestry traffic. | | discouraged | A legal right of way exists (see yes) but usage is officially discouraged (e.g. HGVs on narrow but passable lanes). Only if marked by a traffic sign. | | variable | Value used combination with lanes to denote where access might change e.g. access:lanes=\* to denote a variable-access lane. | | unknown | The access conditions are unknown or unclear. | --- # 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-multi-modal-routing-network/os-mrn-technical-specification/code-lists/accessvalue.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.