Some Local Highway Authorities have agreements with a neighbouring Local Highway Authority that the neighbour must maintain certain Streets in their administrative area. This must be in the NSG in the following manner:

• OD File - For each neighbouring Local Highway Authority that maintains a Street within the administrative area, a separate Operational District must be present in the OD data file. This Operational District nominates the neighbouring Local Highway Authority’s street works system as the INTEREST_TYPE = 1 - Primary Notice Authority.
• Type 61 Interest Record - For each Street maintained under such an agreement there must be two type 61 Interest Records, one to refer the INTEREST_TYPE = 1 - Primary Notice Authority to the maintaining recipient and the other to generate a copy to the owning Local Highway Authority’s street works system.
• The following rules must be applied to the first type 61 Interest Record:
  • STREET_STATUS = 1 – Highway Maintainable at Public Expense must be in the NSG.
  • STREET_STATUS = 4 – Maintenance responsibility is to another Highway Authority must not be in the NSG. This code is reserved for Streets maintained by a National/Regional Highway Authority.
  • INTEREST_TYPE = 1 – Primary Notice Authority must be in the NSG. The owning authority is still the primary notice authority which creates the OD data file.
  • The Operational District number present in the OD data file for the neighbouring Local Highway Authority must be in the DISTRICT_REF_AUTHORITY Field in the NSG.
  • The SWA_ORG_REF_MAINTAINING code for the owning Local Highway Authority, not the neighbouring Local Highway Authority maintaining the Street must be in the NSG.
• The following rules must be applied to the second Record:
  • STREET_STATUS = 1 – Highway Maintainable at Public Expense must be in the NSG.
  • INTEREST_TYPE = 8 – All notices. This generates the copy to the owning Local Highway Authority.
  • The Operational District number present in the OD data file for the owning Local Highway Authority’s street works system to receive a copy, must also be present in the DISTRICT_REF_AUTHORITY Field in the NSG.
  • The SWA_ORG_REF_MAINTAINING code for the owning Local Highway Authority, not the neighbouring Local Highway Authority maintaining the Street must be in the NSG.
• The following rules must be applied to both the type 62 Construction and type 63 Special Designation Records:
  • Type 62 Construction Record – REINSTATEMENT_TYPE _CODE = 11 – Street maintained by another Highway Authority must not be in the NSG. This code is reserved for Streets maintained by a National/Regional Highway Authority.
  • Type 63 Special Designation Record – must not be in the NSG, as appropriate to each designation. If a designation crosses the border between the two Local Highway Authorities, it must be in the NSG for both Local Highway Authorities, for example a culvert under a Street.