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England road-network data for GIS and CAD planning is available free from Ordnance Survey through OS Open Roads. It covers Great Britain (including England) as a generalized, link-and-node network, with GeoPackage, GML, Shapefile and vector-tile downloads. Use it for regional mapping, network measurements and simple drive-time analysis; use the more detailed OS MasterMap Highways Network—Roads when your design needs precise geometry, USRNs, TOIDs or richer highway attributes. The sections below show how to choose, download, inspect and convert the data without treating a high-level planning layer as a navigation-grade road database.
Which official England road dataset should you download?
If you need a free national road layer for planning, start with OS Open Roads. It is generalized and designed for high-level analysis. Move to OS MasterMap Highways Network—Roads when detail, identifiers or highway-specific attributes matter more than an open, lightweight overview.
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| Dataset | Geometry and detail | Identifiers or attributes | Access and update information | Best fit |
|---|---|---|---|---|
| OS Open Roads | Generalized links and nodes representing approximate road-carriageway alignment | High-level network features; not a complete navigation attribute set | Free through the OS Data Hub; published in April and October | Regional or national mapping, network totals, broad accessibility and simple drive-time studies |
| OS MasterMap Highways Network—Roads | More detailed road geometry for highways planning | Includes identifiers such as Unique Street Reference Numbers (USRNs) and topographic identifiers (TOIDs) | OS product information describes monthly updates; access and licensing depend on the intended use. Free small-area sample data is available | Detailed design, asset or street-level analysis and projects that must join to authoritative road identifiers |
| OS Open USRN | Simplified line geometry associated with street identifiers | USRNs | Open dataset | Linking or reporting by street identifier when detailed road geometry is not required |
The OS Open Roads documentation describes questions such as how many kilometres of road exist in Great Britain or what lies within a 25-minute drive of a location. Those are planning and analysis questions, not turn-by-turn navigation. Coverage is Great Britain rather than an England-only extract, so an England project normally downloads the national data and clips it to the required boundary.
How do I download OS Open Roads?
The download is a product selection on the OS Data Hub, not a separate England file. Decide the target software and coordinate system first, then follow these steps.
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- Open the official product page. Use the OS Open Roads page or its linked Data Hub download. Follow any current portal sign-in, acknowledgement or licence prompts shown there; portal requirements can change.
- Choose a distribution format. GeoPackage is usually the simplest desktop-GIS starting point because it packages the national dataset in one file. Choose GML or Shapefile when the receiving application has stronger support for those formats, or vector tiles for tile-based visualisation and web workflows.
- Download the Great Britain package. The file is not limited to England. Keep the original ZIP and record the download date and product edition so a later refresh can be compared with the earlier one.
- Extract into a working folder with adequate space. National packages are large, and extraction can temporarily require more space than the compressed download. Do not rename individual tiles until you know how the target application identifies them.
- Load one layer into a GIS before processing the whole country. Confirm that the road features appear, the linework is in the expected place and the coordinate reference system is recognised. Then create an England clip or another project-area subset.
- Save a project copy with source metadata. Keep the product name, edition, format, coordinate reference system, download date and any processing steps alongside the working data.
The OS OpenData information provides the broader reuse context. Always read the current product and licence wording displayed at download time, particularly if the output will be supplied to a client or embedded in a commercial service.
Which file format is best for a GIS project?
There is no universally best format. Choose the one your GIS can read reliably and that matches how you will distribute or process the data.
| Format | Coordinate system noted by OS | Packaging | Advantages | Watch-outs |
|---|---|---|---|---|
| GeoPackage | British National Grid | One national file containing layers | Convenient for desktop GIS, fewer files to manage and easy to archive as one source package | Large file; confirm that your GIS version supports the required layer types and can handle the national extent |
| GML 3.2.1 | British National Grid | Tiled files | Structured exchange format and useful where an application already supports OS GML | More files to assemble; tile-edge duplicates can occur when features cross boundaries |
| Shapefile | British National Grid | Tiled files | Broad legacy-GIS compatibility | Multiple companion files and tiles; field-name and file-size limitations of the format still apply |
| Vector tiles | Web Mercator | Tile set | Efficient for tiled display and web mapping | Not the same editing workflow as a full feature dataset; confirm whether your CAD or desktop-GIS workflow can consume the tile representation |
These coordinate-system and packaging descriptions are summarized in the OS Open Roads Overview. If the project is being combined with survey, planning or engineering layers, agree on one working CRS before analysis. Reprojecting for display is different from changing the authoritative source geometry, so preserve the original download.
How large is the download, and how much storage do I need?
National road data is substantial. The April 2023 OS overview gave approximate zipped sizes of 568 MB for GML, 566 MB for Shapefile, 973 MB for GeoPackage and 1.3 GB for vector tiles. Those are dated guide figures, not a promise about the current edition. Check the live download size and leave room for the ZIP, extracted files, a clipped copy, temporary processing files and backups.
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GML and Shapefile are tiled. A road feature that crosses a tile boundary can therefore appear in more than one file. When you translate or combine tiles, inspect overlaps and remove duplicates using a controlled, documented procedure rather than deleting lines solely because they look close on a map. Keep an untouched copy of the source tiles so the process can be repeated when OS publishes the next edition.
How do I prepare OS Open Roads for CAD planning?
CAD software varies widely in the GIS formats it can open. Some GIS/CAD packages can read GML directly, while others require an intermediate GIS export. Plan a conversion step unless your specific application documentation confirms direct support.
- Confirm the CAD deliverable. Ask whether the recipient needs editable linework, a reference background, attributes, or a native CAD exchange file. A drawing background may need only selected roads; an analysis hand-off may need the full attribute table.
- Load and validate the source in GIS first. Check the CRS, geometry type, layer names and feature count for the project area. Fixing a CRS mismatch before export is easier than correcting a displaced CAD drawing.
- Clip to the design area. Use an agreed boundary and a small buffer if roads just outside the site influence access or junction design. Keep the national source separate from the clipped working layer.
- Resolve tile overlaps. If you assembled GML or Shapefile tiles, check for duplicated features along tile edges before export. Record the rule used to retain one copy and preserve any needed source identifiers.
- Project to the required coordinate system and units. British National Grid is the documented CRS for the GML, Shapefile and GeoPackage products; vector tiles are in Web Mercator. Your CAD template, survey control and plotting standards may require a particular CRS and unit convention. Transform deliberately and label the result.
- Filter and simplify only when appropriate. Remove classes that are irrelevant to the drawing, but do not simplify geometry if the output will be used to infer a junction or boundary. Open Roads is already generalized, so simplification cannot turn it into detailed design geometry.
- Export using a format your CAD system supports. If a native CAD exchange format is required, use a documented GIS-to-CAD conversion path and check line units, layer names, text encoding and attribute retention. Open the exported drawing in the target application and inspect several known locations against the GIS view.
- Deliver provenance with the drawing. Include the OS product, edition, source CRS, transformation, clip boundary, processing date and a note that the road alignment is generalized. This prevents a planning background from being mistaken for a surveyed design base.
The EDINA Digimap OS MasterMap guidance discusses format support across GIS/CAD workflows. Its advice is relevant to format planning, but it does not mean every CAD application opens every OS Open Roads file without conversion.
What does OS Open Roads actually represent?
OS Open Roads models a road network as links and nodes, with an approximate road-carriageway alignment. The technical specification describes it as a generalized product intended for a viewing range of roughly 1:15,000 to 1:30,000. It is therefore appropriate for showing connectivity and performing broad network analysis, not for setting out kerb lines or reconstructing a surveyed centreline.
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A simple drive-time study can still be useful: for example, comparing which settlements fall within a planning travel-time threshold. However, the network does not supply all the detail needed for a navigation engine. The OS documentation explicitly says that detailed turn-by-turn routing is not supported in OS Open Roads and requires the additional detail and complexity of OS MasterMap Highways Network. Treat any travel-time result as an analysis built from a generalized network, with assumptions about speed, access and restrictions made explicit.
When should I use OS MasterMap Highways Network—Roads instead?
Choose MasterMap Highways Network—Roads when the project depends on detailed road geometry, stable road identifiers or highway-specific information. OS describes the product as updated monthly and lists GML, GeoPackage and vector tiles. Its product page also provides free small-area sample data, which can help you check format compatibility before committing to a wider purchase or licence.
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MasterMap is not automatically the right answer for every project. Confirm the current access route, licence and permitted use for your organisation, area and application. A detailed product is worthwhile only when the extra geometry or attributes answer a real planning requirement; for a national overview, Open Roads is easier to obtain and free.
What is OS Open USRN, and is it enough for street-based reporting?
OS Open USRN is an open dataset of Unique Street Reference Numbers with simplified line geometry. It can be useful when the central task is joining records or reporting by street identifier. It should not be treated as a replacement for the detailed road geometry in MasterMap Highways Network—Roads, nor as a complete routing network.
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For a project that needs both identifiers and geometry, decide which layer is authoritative for each purpose. You may use an identifier-focused dataset for joins and a separate detailed highways layer for mapping, but document the relationship and edition of each source.
How often is the data updated?
OS Open Roads is published in April and October, giving it a roughly six-month refresh cycle. MasterMap Highways Network—Roads is described by OS as updated monthly. A planning model that spans several years should therefore store the edition used for every analysis and establish a refresh rule rather than silently replacing the source file.
When comparing editions, distinguish real network change from processing differences. Use the same clip boundary, CRS, duplicate-removal method and classification filters, and keep a change log. Do not present a newer edition as proof that every local road has been surveyed at the date of download; the product’s generalized purpose and update cadence still apply.
What are the main limitations and failure modes?
- Expecting an England-only file: the open product is Great Britain coverage. Download it, then clip to England or your project boundary.
- Using it for navigation: Open Roads is not suitable for in-vehicle navigation or detailed turn-by-turn instructions. Use a more detailed, appropriately licensed network for that requirement.
- Assuming it proves maintenance responsibility: road ownership and maintenance responsibility are not supplied as a definitive answer by this generalized layer. Obtain the relevant detailed highways information or authority records.
- Mixing coordinate systems: a Web Mercator vector-tile layer can appear displaced when treated as British National Grid. Read the CRS metadata instead of relying on a file extension.
- Loading every tile as a separate analysis layer: tile boundaries can create duplicate features and fragmented selections. Merge or query tiles with a documented deduplication and validation step.
- Sending raw GIS files to CAD users: the recipient may need a conversion, a projected drawing and a reduced area of interest. Confirm the target application and deliverable before exporting.
- Interpreting generalized lines as surveyed design geometry: use Open Roads for context and high-level planning, not setting-out, curb design, legal boundary determination or construction dimensions.
- Ignoring licence terms: open access does not remove the need to follow the current OS reuse conditions. Recheck the terms when the data is redistributed or embedded in a service.
What is a practical download-and-delivery checklist?
- Define whether the job needs a national overview, a local detailed highways base, street identifiers, routing restrictions or maintenance responsibility.
- Select OS Open Roads, MasterMap Highways Network—Roads or OS Open USRN accordingly.
- Confirm the live edition, access conditions and permitted reuse on the official OS page.
- Choose GeoPackage, GML, Shapefile or vector tiles according to the receiving GIS/CAD workflow.
- Record the source CRS: British National Grid for the documented GML, Shapefile and GeoPackage products, or Web Mercator for vector tiles.
- Download and archive the original package, then extract to a workspace with sufficient temporary storage.
- Validate a small area before processing the national file; clip to England or the project boundary.
- Check for tile-edge duplicates when assembling tiled formats.
- For CAD, transform to the agreed CRS and units, export through a supported conversion path and inspect the result in the target application.
- Deliver a short provenance note with product, edition, CRS, processing date, clip extent and the limitations of generalized road geometry.
Which dataset is the sensible default?
For most high-level England planning maps and GIS analyses, download OS Open Roads in GeoPackage if your software supports it. It is free, national, comparatively simple to manage as one file and appropriate for generalized network questions. Use the tiled GML or Shapefile versions when compatibility requires them, and use vector tiles for tile-oriented display workflows.
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Escalate to OS MasterMap Highways Network—Roads only when the project needs its additional geometry, USRNs, TOIDs or highway detail, and verify the current commercial access and licensing terms. Whichever product you choose, keep the source edition and CRS visible in the GIS project and CAD hand-off so a useful planning layer is not mistaken for a definitive navigation, maintenance or construction-survey dataset.
Frequently Asked Questions
Is OS Open Roads an England-only download?
No. The product is a Great Britain dataset, so England is included alongside Scotland and Wales. Create an England-only working layer by clipping the downloaded coverage to an agreed boundary, and retain the national source if later analysis may cross the border.
Can I calculate a 25-minute drive-time area from OS Open Roads?
You can use it for high-level drive-time analysis, but you still need a routing or network-analysis workflow and explicit assumptions about speeds, access and restrictions. The result should not be presented as turn-by-turn navigation or as a guarantee that every vehicle can use every represented link.
Why do I see duplicate roads after joining GML or Shapefile tiles?
OS documents that features crossing tile boundaries can occur in more than one file. Inspect the overlap, apply a repeatable deduplication rule during assembly and keep the original tiles so the result can be audited or rebuilt after the next edition.
Do I need British National Grid for a CAD drawing?
Not necessarily; the required CRS depends on the survey control, project standards and receiving CAD system. The documented GML, Shapefile and GeoPackage products use British National Grid, while vector tiles use Web Mercator, so transform deliberately and record the CRS and units in the deliverable.
Can I redistribute an OS Open Roads extract to a client?
Check the current OS product and reuse terms for your intended redistribution, especially when supplying processed data or embedding it in a commercial service. Include the source product and edition in your hand-off documentation and do not assume that a free download removes all attribution or licence obligations.
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