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We've looked at this in some detail as we use Ordnance Survey data to build our representations of the highways network for safety inspections. We ended up using the OS MasterMap Roads and Paths products as the ESU (elementary street unit) provided more granular detail that the NSG and USRN's on their own. The ESU's also can be joined together to form USRN's using the 'forms part of' table from the OS. The thinking was that you could have the best of both worlds. Further research after that point led us to consider the OS Topographical area dataset because the TOID's in that can also be linked to the ESU's within MasterMap and therefore to the USRN's, with the added benefit of defining roads as polygons rather than line data. Still working on a solution though.
By only two criteria I mean to plot the item. Attribute recording would be another step.
I'm thinking of assets, defects and customer service requests for this example.
If the USRN is collected in the first instance you should then be able to link to other networks if needed for data extrapolation and interrogation in data explorer.