OS MasterMap Highways Network with Speed Limits

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.