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SAON (Secondary Addressable Object Name)

A number and / or a name for the LPI associated with the BLPU. See also BS 7666-2:2006, page 1, section 3.1, for definition.

SED (Special Engineering Difficulty)
Special Engineering Difficulty
Service Road

A minor road for providing services to properties.

Sewer Authority

An authority responsible for sewers.

SNN (Street Naming and Numbering)

Street Naming and Numbering Function performed by an SNN Authority under the statutory legislation, responsible for the approval of all Street Names, property name and numbering schemes within that SNN Authority administrative area.

SNN Authority

A District or Unitary with an SNN responsibility.

SNN Officer

Officer at an SNN Authority responsible for SNN.

Special Designation

A Record that defines the status of a Street with respect to works. A category of ASD. Also known as a type 63 Record.

Special Event

An event that happens only occasionally on the Street.

Special Road

A Highway over which the rights are limited to a selection of eleven possible prescribed classes.

See also Sections 16 to 20 of the Special Roads Act 1949. Schedule 4 of the Highways Act 1980.

Speed Limit

The maximum speed a motor vehicle can legally travel on a Street.

Statutory Undertaker

An organisation with legal powers to carry out works on a highway, for example a utilities company. See Section 49 of the New Roads and Street Works Act 1991.

Strategic Route

A network of strategic routes across England and Wales managed by Highways England, Transport for London and the South Wales Trunk Road Agent (SWTRA) and North & Mid Wales Trunk Road Agent (NMWTRA).

Street Authority

The authority, body or person liable to maintain a Street.  If the Street is publicly maintainable then it is a Highway Authority.  Also known as Street Works Authority. 

See Section 49 of the New Roads and Street Works Act 1991.

Street Data

Defined in the GeoPlace DEC-Addresses as data associated with a type 11 or a type 15 Record.

Street Description

Defined in the GeoPlace DEC-Addresses as Text associated with the description of a type 2, 3, 4 or 9 Street in the ASG.

See also BS 7666-1:2006, page 2, section 3.8 for definition.

Street Descriptor
All Fields associated with the type 15 Record in the DTF current version.
Street Lighting

The provision of lighting on the public Highway.

See also BS 5489 2003 and BS EN 13201 2003.

Street Manager

An authority, body or person liable to the public to maintain or repair a street which is not a publicly maintainable highway or, if there is none, an authority, body or person having the management or control of the street.

See also Section 49 (4) of the New Roads and Street Works Act 1991.

Street Name

Official text approved by the SNN Authority used to describe a type 1 Street.

Street Record

Text used to describe a BLPU which represents the entire Street.

Street type

A value that indicates whether a name, description or number has been used to identify a Street or part of a Street.  This Street type may be recorded numerically with a code of 1, 2, 3 or 4.  A code of 9 is also permitted within the ASG.

See also BS 7666-1:2006, page 11, section 6.7.2, table 4 for definition.

Street Works Authority

See 'Street Authority'. Also see Section 49 of the New Roads and Street Works Act 1991.


Defined in the GeoPlace DEC-Addresses as one of the following:

  • As described in the New Roads and Street Works Act 1991: a highway, road, lane, footway, alley, passage, square or court.

  • As described in Towns Improvement Clauses Act 1847 s3: any road, square, court, alley, and thoroughfare.

  • As described in BS 7666-1:2006, page 2, section 3.7.

See Section 48 of the New Roads and Street Works Act 1991, and Section 3 of the Towns Improvements Clauses Act 1847.


A pedestrian underpass beneath a Street.

Surveying Authority

The authority responsible for maintaining the Definitive Map of Public Rights of Way. See Wildlife and Countryside Act 1981.


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