> For the complete documentation index, see [llms.txt](https://docs.os.uk/osngd/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/osngd/using-os-ngd-data/os-ngd-transport/cycle-lanes/known-limitations.md). # Known limitations There are some known limitations for cycle lane data: * **Completeness**: Cycle lanes have been captured from aerial imagery and therefore there are some limitations to completeness. Where features are not visible from aerial imagery, these will not be included unless they have been identified through other intelligence sources (for example, targeted ground surveying based on intelligence sources). In particular, the completeness of Unsegregated Shared Use Cycle Lanes will be lower as these features are typically indicated by blue signage at street level and don’t have clear designation that can be seen from aerial imagery. You can report any cycle lane omissions on the [OS Data Hub Error Reporting Tool](https://osdatahub.os.uk/apps/errors-and-omissions) for OS to investigate. * **Linking to the Road and Path Network**: The accuracy of the linking between Cycle Lane features and the Road and Path Network is dependent on the performance of an algorithm. In areas of complex network geometry (for example, at junctions or where cycle infrastructure jumps between the Road and Path Network) there are limitations to the accuracy of the linking algorithm. --- # 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/osngd/using-os-ngd-data/os-ngd-transport/cycle-lanes/known-limitations.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.