> 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/roadclassificationvalue.md).

# RoadClassificationValue

Classification of roads exists to ensure that there is a feasible, logical road network throughout the country. Road classifications should be set to take into account the traffic management goals and road categorisation approach of the local highway authority (LHA).

The RoadLink feature is attributed with a *roadClassification* with a data type of *RoadClassificationValue*. The following table lists the codes which are used populate this field and gives a description for each code.

## **Code List: RoadClassificationValue**

| Code                  | Description                                                                                                                                                                                                                                                                                                                                                                                         |
| --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Motorway              | A multi-carriageway public road connecting important cities, classified by the Department for Transport. A Motorway does not form part of the official road classification scheme as it is a Special Road. However, it has been included to allow them to be classified.                                                                                                                            |
| A Road                | A major road intended to provide large-scale transport links within or between areas.                                                                                                                                                                                                                                                                                                               |
| B Road                | A road intended to connect different areas and to feed traffic between A roads and smaller roads on the network.                                                                                                                                                                                                                                                                                    |
| Classified Unnumbered | <p>Smaller roads intended to connect unclassified roads with A and B roads; often linking a housing estate or a village to the rest of the network.</p><p><em>Note 1: These were ‘minor roads’ in ITN (retired OS product) and are sometimes known unofficially as C roads.</em></p><p><em>Note 2: A Street may be assigned a local classification number by the local highways authority.</em></p> |
| Unclassified          | <p>Roads intended for local traffic.</p><p><em>Note 1: The vast majority (60%) of roads in the UK fall within this category.</em></p><p><em>Note 2: These may be designed unofficial local road classifications, for example, D, E, F and G roads.</em></p>                                                                                                                                         |
| Not Classified        | Roads that have not been assigned a road classification at national or local level by a designation authority.                                                                                                                                                                                                                                                                                      |
| Unknown               | The classification of the road is unknown because the RoadLink is not a Motorway, A or B road, and the RoadLink has not been matched to any other road classification at national or local level.                                                                                                                                                                                                   |


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