Ordnance Survey has completed a two-year programme of quality control on its transport dataset - OS MasterMap Integrated Transport Network (ITN) Layer.

The programme has seen every road link in Britain checked by an Ordnance Survey data editor to ensure quality levels are maintained consistently across the country.

ITN Layer records the location of the nation’s roads, forming the foundation to many of the market-leading satellite navigation systems, and is relied on by the emergency services for route planning.