# OS MRN Technical Specification ## Product overview OS Multi-modal Routing Network (OS MRN) provides a fully connected road, rail, path and ferry network across Great Britain Road. It includes turn and vehicle access restrictions, road speed information, and modal change points where you can change transport mode. ## Index The sub-sections in this technical specification describe the: * [Feature types](/os-downloads/products/transport-network-portfolio/os-multi-modal-routing-network/os-mrn-technical-specification/feature-types.md) available within the OS MRN product * [Code lists](/os-downloads/products/transport-network-portfolio/os-multi-modal-routing-network/os-mrn-technical-specification/code-lists.md) used by attributes available in those feature types --- # Agent Instructions: 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: ``` GET https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-multi-modal-routing-network/os-mrn-technical-specification.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.