OS MasterMap Highways Network Known Data Issues

This page lists known data issues in relation to the OS MasterMap Highways Network products. Once resolved, details of an issue will be held on the page until the next release of the products.

Live known data issues

Data Issue Name	Data Issue Description	Product(s) Affected by the Issue
Overlapping Path Links	There are 49 instances of overlapping Path Links. This issue is being investigated.	OS MasterMap Highways Network – Paths
Short Network Links	There is 1 Connecting Link that is less than 1m in length. This issue is being investigated.	OS MasterMap Highways Network – Paths
Streets without maintenance records	There are 8 features in the Street table which have a street type of either Designated Street Name or Officially Described Street and have no associated maintenance record. This issue is being investigated by GeoPlace and Improvement Service.	OS MasterMap Highways Network – Roads and OS MasterMap Highways Network – RAMI
Isolated Road Links	A total of 156 non-track Road Links are disconnected from the main network or not properly connected at a node. These are not on major parts of the network. This issue is being investigated.	OS MasterMap Highways Network – Roads and OS MasterMap Highways Network – RAMI

Resolved data issues

Data Issue Name	Data Issue Description	OS MasterMap Highways Network – Paths	Resolution Date
Streets with unexpected associated maintenance, reinstatement and special designation records	There is 1 feature in the Street table which does not have a street type of either Designated Street Name or Officially Described Street, but does have associated maintenance, reinstatement and special designation records.	OS MasterMap Highways Network – Roads and OS MasterMap Highways Network – RAMI	November 2025
Path Links and Road Links representing same feature	There are 9 instances of a non-tunnel Road Link and a non-subway or footbridge Road Link overlapping, representing the same real world feature.	OS MasterMap Highways Network – Roads, OS MasterMap Highways Network – RAMI, and OS MasterMap Highways Network – Paths	September 2025

To report an issue not currently listed here, please visit the 'Contact us' page on the OS website.