5.2.1
The following rules must be applied to every Street within the administrative area of an SNN Authority ASG to ensure the complete Street network is defined:
- Every type 1 Street must be entered.
- Every type 2 Street must be entered.
- Every type 3 Street should be entered.
- Every type 4 Street should be entered.
- A type 9 Street may be entered if required.
5.2.2
The geographical extents associated with town names must be contiguous. BS 7666-1:2006 defines a town as ‘city or town that is not an administrative area or a suburb of an administrative area that does not form part of another town’. Within this definition, each town should have a defined area across the country and there should be no gaps between towns. This is particularly relevant if a Street runs through multiple towns. Also see Section 5.3.10.
5.2.3
The current use of the locality Field is to differentiate between two Streets with the same name in the same town. This duplication occurs for historical reasons, for example administrative boundary changes. For new Streets created by the SNN Authority, care must be taken to ensure that a Street Name and town name combination is not duplicated, see Section 4.3.1.1.
5.2.4
Type 9 Street Records must only be used for rivers, canals, waterways and railways.
5.2.5
If a Postal Address is to be associated with a newly constructed Street through the LPI Record, the new Street Record must be a type 1 Street Record.
5.2.6
As a minimum, if a Street is entered in both an ASG and a Local Street Gazetteer (LSG), then the populated attributes which are associated with that Street must be identical in both gazetteers. The exception to this is the entry date. This Field must show the true entry date of the Street in each gazetteer, therefore may be different depending on the information exchange process which is in place.
5.2.7
The USRN allocated must be selected from the range allocated to the SNN Authority. For further information see Section 5.3.6.7.
5.2.8
The objective is to ensure that all the Records in an ASG are replicated in an LSG and vice versa. The LSG is maintained by the Local Highway Authority (LHA) function for the purposes of the NSG in accordance with the DEC-NSG, BS 7666-1:2006 and the New Roads and Street Works Act 1991.