OS MasterMap Integrated Transport Network Layer

The most current and complete network view of Great Britain's roads available today – all 550,000kms of it – OS MasterMap® Integrated Transport Network™ Layer underpins key routing applications. Get a quote ›


For accuracy, this is the most current and comprehensive network view of Great Britain's roads available today - all 550,000kms of it.

For confidence, you’ll avoid complaints about showing out-of-date data – we survey new roads and changes within six months of completion on the ground.

For ease of use, you can take full advantage of interoperability, as OS MasterMap Integrated Transport Network Layer links to roads shown in the OS Mastermap Topography Layer.

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Every road, everywhere

With more than 550,000kms of route mapped out in glorious detail, OS MasterMap Integrated Transport Network Layer is ideal for route calculations – route planning, analysis or in-vehicle instruction.

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Up-to-date detail

ITN Layer delivers detail of any new works’ completion on the ground within six months – right across Great Britain. We catalogue motorways, A roads, B roads, minor roads, local streets and private roads, all to the most exacting specification.

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No limits on no access

More than a million banned turns, one-way streets, time or vehicle-based restrictions are included. ITN Layer lets you make better-informed routing decisions for logistics operations, transport and route planning with intelligent routing algorithms.

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Urban paths all mapped out

Our dataset of pedestrian routes across towns in Britain lets you create routes for walkers and cyclists. It includes path names, pedestrian ferry links and access information, such as steps or subways.


Key featuresWhat this product offers

GML 2.1.2 (supplied in compressed .gz format).

Type of roads

Motorway, A road, B road, minor road, local street, alleyway, private roads – publicly accessible, private road – restricted access, pedestrianised streets

Road Routing Information

Access restrictions; bridge over road; firing range; ford; gate; level crossing; mandatory and banned turns; one-way; physical weight and width restrictions; rising bollards; severe turn; steep and very steep gradients; through route; toll indicator; and traffic calming.


Urban paths

Man-made paths in urban areas of Great Britain larger than 5km2.

Update frequency

Every six weeks (view release schedule). Full re-supply, change-only updates or managed GB set options are available. Urban Paths Theme is updated quarterly.


DVD or FTP (for orders under 2Gb).


Great Britain

OS MasterMap Integrated Transport Network Layer support ›


How is this data supplied and what do I need to use it?

ITN Layer is supplied on DVD. If the file size of your order is smaller than 2Gb, you can get it from our FTP server. In addition, public sector customers can download 5km chunk orders via our download service.

You'll need geographic information system (GIS) software to use ITN Layer.

If sat nav devices are routing vehicles wrongly, can I make changes to ITN to correct this?

We can check the road designation – A-road, minor, private – and if there are any physical or signed restrictions in place. But the actual route from one destination to another is worked out by providers of software and data for sat nav devices.

Please see Sat nav systems and OS data for more information, and links to report errors to manufacturers.

How is the road network described in ITN Layer?

RoadLink features represent individual sections of road and show the general alignment of the carriageway. Attribution information for each RoadLink describes the road's type and nature.

Road type classifications include motorway, A road, B road, minor road, local street, private road (publicly accessible), private road (restricted access), alley and pedestrianised street. Road classifications include single carriageway, dual carriageway, slip road, roundabout and traffic island.

Relationships at the ends of RoadLink features describe connectivity. A relative third dimension allows for roads crossing at different levels.

Compound features that reference RoadLink features represent named and numbered roads, and their extents.

How is information about routing represented in ITN Layer?

The Road Routing Information (RRI) theme of ITN Layer brings together factors that might affect a driver's choice of route. These include physical restrictions, permissions and other signed information for drivers.

The restriction information is referenced rather than applied to the base network. This means we can in future extend the range of information collected. And if you aren't looking for routing information, you don't need to use it.

The main categories of restriction information captured are as follows:

  • One way
  • No entry
  • Access prohibitions
  • Access limitations
  • Turn restrictions
  • Mandatory turns

To whom the restrictions apply and any time constraints are also captured.

See all FAQs for OS MasterMap Integrated Transport Network Layer ›


OS MasterMap Integrated Transport Network Layer is available under the following Licences:

Free trial

You can license this data free to evaluate it for your internal business use or to develop products and services prior to commercialisation.

Internal business use

When using OS data in your own business, you need our Framework Contract (Direct Customers) together with a data contract.

Creating products or services

To use this data commercially in your own products and services, or to distribute it, you will need to sign up to our Framework Contract (Partners) and a relevant defined use contract. This will vary depending on what you’re going to do with the data.

Collective mapping agreements

These products are available to members of public sector organisations under the following agreements:

Find out more in our Public sector licensing guide ›

This product is available under the:

  • Media Licence. We encourage the use of OS maps in the media – TV, films, print and online. Sign up free to give your consumers valuable context via an authoritative map.
  • Publishing licence. This is suitable for one-off publishing of maps in publications, on merchandising and websites.
View all licences ›

Case studies

Select an area and get a tailored quote

Get a quote Existing customer?
You can order data here

Give it a try

Download a small area of OS MasterMap Integrated Transport Network Layer sample data

Or you can apply for an Evaluation Licence to try out the real thing.

If you're in the public sector, this product is free of charge thanks to your mapping agreement.