Integrated Transport Network

The Integrated Transport Network (ITN) is a dataset containing details of Great Britain's transport network. Produced by Ordnance Survey – the national mapping agency of Great Britain – it forms part of the OS MasterMap suite of products.

This article is about the Ordnance Survey dataset of transport networks of Great Britain. For networks of transport routes, see Integrated route network.

Designed to streamline route planning and resource management, the dataset comprises three key elements: Road Network (detailing road geometry), Road Routing Information (providing drivers with routing details such as mandatory and restricted turns), and Urban Paths (depicting the geometry of man-made paths in urban areas).

The network is a link-and-node based network containing such details about each link as:

  • the class of road (A-road, B-road, etc.);
  • the nature of the road (single carriageway, dual carriageway, roundabout, etc.);
  • road names;
  • road routing information (RRI) (e.g. prohibited turns, one-way streets).

These data are supplied in Geography Markup Language file format.

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