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What is the NSG?

The National Street Gazetteer (NSG) contains authoritative information for streets in England and Wales.  Primarily it allows local authorities to manage all streetworks carried out by themselves and by statutory undertakers in an efficient manner on the national road network.

It was created to coordinate the process of streetworks in England and Wales, helping to prevent streets being repeatedly dug up over a period of months by different utility companies and local authorities.  It provides a unique referencing system, is embedded in legislation and is fundamental in the processes of managing all streetworks.

The NSG is used for a variety of services within local authorities, not only to underpin streetworks but as the core dataset in activities that use street data.  This makes the NSG a key strategic data source within local authority internal management systems.

Local Street Gazetteers (LSGs) are created and maintained under statute and are compiled at a national hub, managed by GeoPlace to create the NSG.  All 173 highway authorities across England and Wales upload their LSG data to the NSG hub on a monthly basis, where the information is then verified and made available to licenced users via web downloads.

Consolidating this information at a national level means that there is improved consistency of data. It allows third party organisations such as public utilities to go to a central place to obtain the data, and it allows all to meet their statutory highway requirements to coordinate and provide the appropriate streetworks notifications.


Creating a national resource

On a monthly basis, all 173 local highway authorities across England and Wales upload their LSGs, along with Additional Street Data (ASD), to the NSG hub. This enables third party organisations such as public utility providers to meet their statutory highway requirements to provide the appropriate street works notifications.

The following types of streets are included in the NSG:

  • motorways and trunk roads
  • classified numbered streets
  • publicly maintained streets
  • prospective publicly maintained streets
  • private streets known to the highway or roads authority
  • footpaths
  • subways

As well as containing details about streets, the NSG also contains Additional Street Data (ASD).  ASD provides additional information about a Street. Predominantly to aid the streetworks process.

There are four types of ASD:

  •  type 61 Interest Records
  •  type 62 Construction Records
  •  type 64 Height, Weight and Width Restrictions
  •  type 63 Special Designation Records including:
    • traffic sensitive streets
    • streets with special engineering difficulties
    • speed limit data
    • level crossing safety zones
    • environmentally sensitive areas
    • streets with special surfaces
    • streets with priority lanes
    • streets with special construction needs
    • height, weight and width restrictions
    • direction restrictions

By pooling this information at a national level, local government is investing in a rich and mature dataset which helps keeps the nations traffic moving.