This section describes the features which make up OS MasterMap Highways Network with speed limits. The attributes associated with these feature types are listed below along with a brief description of their data properties.
Speed limits are supplied in Esri shapefile (.shp) and an example record (instance) will appear in the following format:
| ESRI shapefile attribute | Example record value |
|---|---|
Os_link_id
osgb5000005196984950
Speed
30
Shape
Polyline ZM
The OS MasterMap Highways Network with Speed Limits product contains detailed speed limit information based upon traffic signage. Many other speed datasets are built by sending vehicles around the UK; however, this product captures speed limit information and validates it more frequently through the following sources:
Accident information
Telematics data
FOI requests
Road layout logic
Local Authorities
An online visual tool that is used to manage the updates which is accessed by numerous trusted users
The OS MasterMap Highways Network with Speed Limits product provides information on the signed speed limit of a road. Speed Limits are collected from various sources such as local authorities, telematics, accident reports, police forces and trusted users. The product provides a single speed limit value for each OS MasterMap RoadLink feature.
The speed limit is provided in miles per hour (mph). Road Link features within the OS MasterMap Highways Network do not break for a change in speed limit. Therefore, the speed limit provided is the speed which predominantly covers the road link. Speed Limits has full national coverage and accuracy is aimed to be at 98% by road length at the time of publishing.
The context diagram shows the feature attribution of Speed Limits data and the relationship to the OS MasterMap Highways Road Link feature. This is a one-to-one relationship and is realised through the “Os_link_id” attribute in the SpeedLimits feature.
The name of the attribute and what it is describing.
The nature of the attribute, for example a numeric value or a code list value.
The length of the attribute provided (optional).
Describes how many times this element is expected to be populated in the data. An attribute may be optional or mandatory within the product. These are denoted by:
‘1’ – there must be a value.
‘0..1’ – population is optional but a maximum of one attribute will be returned These values may be used in combination.
The Speed Limit on a highway.
Unique identifier, for OS MasterMap Road Link feature, this is a TOID.
Type: CharacterString
Multiplicity: [1]
This is the speed limit value per road link.
Type: Double
Multiplicity: [1]
The geometry that represents the centreline of the road link.
Type: Polyline ZM
Multiplicity: [1]