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The National Street Gazetteer holds Additional Street Data (ASD), which is collected and managed alongside the information collected each month from Local Street Gazetteers (LSGs). ASD can provide extra information about a street, mostly to make sure streetworks are planned and executed efficiently

There are four types of ASD:

  • type 61 Interest Records – who maintains or has an interest in the street (or part of the street)
  • type 62 Construction Records – the basic construction of the street in terms of traffic levels and any special surfaces
  • type 64 Height, Weight and Width Restrictions
  • type 63 Special Designation Records – a wealth of additional information

Interest Records and Construction Records

These two types of records are the back bone of the ASD data and are required for every street included in the NSG.

These records ensure that the right organisations are contacted to coordinates street works and that anyone undertaking works knows what type of street they are digging into.

Special Designation Records

What are Special Designation Records?

Special Designation records are created by Local Highway Authorities to provide additional information on any special attributes of a street. The aim is to make it easier for anyone doing street works to have all the information they need to be able to plan their works properly and minimise unnecessary disruption and delay.

What types of Special Designation Records are there?

There are currently 24 different types of Special Designation records. Some examples of the type of extra information recorded against streets include:

  • traffic sensitive streets / lane rental streets where a highway authority may have additional restrictions on working times / durations
  • streets with special engineering difficulties where additional planning may be required to protect the asset / apparatus
  • speed limits which may impact on the layout of streetworks
  • level crossing safety zones
  • traffic signals and sensors
  • environmentally sensitive areas
  • streets with special surfaces
  • streets with priority lanes
  • streets with unusual layouts / local considerations

Height, Width and Weight Records

These records are designed to prevent anyone working on the street using equipment that is too tall, wide and/or heavy for the street they are working on. This helps ensure that street works are planning and completed as quickly as possible, without any delays caused by height, or weight restrictions.

Access to this level of detail is restricted primarily to the streetworks community and defined by the New Roads and Street Works Act 1991: those planning and executing works on the highway. Data is collated by each local highway authority, logged centrally with the NSG and shared each month by way of national publication by GeoPlace to registered users.


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