5.4.2.1
Some events that mean a change or addition made to Street Data are:
- Proposed construction of a new Street.
- Construction of a new Street.
- Naming of a new Street.
- Permanent closure of an existing Street.
- Re-alignment of an existing Street (small geometry change).
- Re-alignment of an existing Street (significant geometry change).
- Re-naming of an existing Street.
- Amendment of incorrect Record attribution.
- Change of responsibility for a Street due to local authority administrative boundary changes or where maintenance agreement changes are agreed with National/Regional Highway Authorities / neighbouring LHAs.
See Appendix D, for Street life cycle scenarios and decisions and see Table 5 below.
5.4.2.2
If a new Street is built, a new Street must be recorded with a new USRN from the SNN Authority’s allocated range.
5.4.2.3
A Street under construction must be recorded in the LSG. In this case the Record must be recorded as the date it was entered into the LSG.
5.4.2.4
If the Street is unnamed at the time the Record is recorded in the LSG it can be recorded as a type 2 Street.
5.4.2.5
When construction of the Street is completed or when the Street is officially named the Street must be recorded (with the last update date) and the official Street Name recorded in the appropriate Field, replacing the description.
5.4.2.6
If a Street is permanently closed, no longer has highway rights and no longer exists on the ground, the Record must be closed. The Record must not be deleted from the LSG in case it is required for history purposes.
5.4.2.7
The USRN applies to the geographic area of the Street. A USRN can have more Records attached to it in other systems than those in the LSG. For example, street lighting records, waste collection rounds or gritting routes.
5.4.2.8
Therefore, changes to a Street Name must not result in a new USRN. All Street Name changes must be shown by amending the Street Data of the existing USRN.
5.4.2.9
Street or USRN attribution refers to the Street name, locality name, town name or alias name of a Street.
5.4.2.10
If any of these attributes are changed this must be reflected in a new instance of the USRN Record. A new USRN must not be created.
5.4.2.11
LSGs must not contain USRNs from adjacent SNN Authority and LHA ranges. Sharing USRNs causes duplication problems when the data is compiled into the NSG except as provided for in Section 5.4.2.12.
5.4.2.12
If Streets are exchanged between authorities, because of local authority administrative boundary changes or re-organisation, the Street must be removed from the previous authority’s LSG and keep its USRN when it is transferred to another authority.
5.4.2.13
This process must be undertaken in consultation with GeoPlace.
5.4.2.14
Changes in Street geometry do not always result in a new USRN. If changes are made for the following reasons, the Record must be amended but the USRN remains the same:
- If a mistake is made when digitising or identifying start and end points.
- If a Street or an existing ESU is lengthened or a new ESU is added to the Street, for example during new build development or regeneration programmes.
- If lengths of highway are straightened for safety or environmental reasons as part of road improvement programmes. Providing the start and end of the Street remains the same, a new instance of the USRN must not be created. The ESUs may have their geometry amended, and may be added to or closed, within the existing Street.
5.4.2.15
New USRNs must be created by the SNN Authority when a Street is split into 2 or more different Streets.
5.4.2.16
If a Street is split into two or more different Streets, each SNN Authority must add a new USRN, resulting in each Street having its own USRN. One of those new Streets may keep the original USRN if the Street Name is unchanged.
5.4.2.17
If a Street or section of Street is closed, then the ESU Records for that Street or section must also be closed. The closed ESU Records must not be deleted from the LSG unless they were created in error.
5.4.2.18
For information about creating new USRNs, see Section 5.3.
5.4.2.19
Table 5 - change types
Change type and creating a new instance of Streets
Proposed construction of a new Street or construction of a new Street
Naming of a new Street
Permanent closure of an existing Street
Re-alignment of an existing Street (small geometry change)
Re-alignment of an existing Street (significant geometry change)
Re-naming of an existing Street
Amendment of incorrect record attribution
Change of responsibility of a Street due to local authority administrative boundary changes
Split Street into two, one new name (one Street keeping the original name, one Street new name)
Split Street into 2 (both new names)
Correction of errors in Street geometry or start/end points, see Section 5.4.2.14
Extension of Street geometry, see Section 5.4.2.14
Change of Street geometry, see Section 5.4.2.14