This dataset is refreshed on a weekly basis from the datasets the team works on daily.Last update date: 20 November 2025.National Highways Operational Highway Boundary (RedLine) maps out the land belonging to the highway for the whole Strategic Road Network (SRN). It comprises two layers; one being the an outline and another showing the registration status / category of land of land that makes up the boundary. Due to the process involved in creating junctions with local highway authority (LHA) roads, land in this dataset may represent LHA highway (owned by National Highways but the responsibility of the LHA to maintain). Surplus land or land held for future projects does not form part of this dataset.The highway boundary is derived from:Ordnance Survey Mastermap Topography,HM Land Registry National Polygon Service (National Highway titles only), andplots researched and digitised during the course of the RedLine Boundary Project.The boundary is split into categories describing the decisions made for particular plots of land. These categories are as follows:Auto-RedLine category is for plots created from an automated process using Ordnance Survey MasterMap Topography as a base. Land is not registered under National Highways' name. For example, but not limited to, unregistered ‘ancient’ highway vested in Highways England, or bridge carrying highways over a rail line.NH Title within RedLine category is for plots created from Land Registry Cadastral parcels whose proprietor is National Highways or a predecessor. Land in this category is within the highway boundary (audited) or meets a certain threshold by the algorithm.NH Title outside RedLine category is for plots created in the same way as above but these areas are thought to be outside the highway boundary. Where the Confidence is Low, land in this category is yet to be audited. Where the Confidence is High, land in this category has been reviewed and audited as outside our operational boundary.National Highways (Technician) Data category is for plots created by National Highways, digitised land parcels relating to highway land that is not registered, not yet registered or un-registerable.Road in Tunnel category, created using tunnel outlines from Ordnance Survey MasterMap Topography data. These represent tunnels on Highways England’s network. Land is not registered under National Highways' name, but land above the tunnel may be in National Highways’ title. Please refer to the definitive land ownership records held at HM Land Registry.The process attribute details how the decision was made for the particular plot of land. These are as follows:Automated category denotes data produced by an automated process. These areas are yet to be audited by the company.Audited category denotes data that has been audited by the company.Technician Data (Awaiting Audit) category denotes data that was created by National Highways but is yet to be audited and confirmed as final.The confidence attribute details how confident you can be in the decision. This attribute is derived from both the decisions made during the building of the underlying automated dataset as well as whether the section has been researched and/or audited by National Highways staff. These are as follows:High category denotes land that has a high probability of being within the RedLine boundary. These areas typically are audited or are features that are close to or on the highway.Moderate category denotes land that is likely to be within the highway boundary but is subject to change once the area has been audited.Low category denotes land that is less likely to be within the highway boundary. These plots typically represent Highways England registered land that the automated process has marked as outside the highway boundary.Please note that this dataset is indicative only. For queries about this dataset please contact the GIS and Research Team.

This series consists of plans relating to the resumption or acquisition of land either by negotiation and an agreed sale or compulsorily. The plans also include information relating to disposal of land.

The plans consist of drawings of areas designated for infrastructure projects and were used to chart proposed acquisitions and proposed project alignments and then updated to show the acquisitions, disposals, dedications/declarations as they occurred. They contain references to the corresponding file numbers of all the acquisition files relating to each project.

The power of the Australian parliament to make laws regarding the acquisition of property on ‘just terms’ is enshrined in the Australian Constitution (1901) in Section 51(xxxi).

NSW established compulsory acquisition and resumption requirements to encompass cases where private property was directly affected by construction plans for roads in NSW. The Commissioner of Main Roads was authorised to acquire property for the Department of Main Roads as part of road construction, under the Main Roads Act (Act No 24 of 1924). NSW could also resume, withdraw or vest land for roads under the Public Works Act (Act No 45 of 1912) and the Public Roads Act (Act No.95 of 1902).

Department of Main Roads and Roads and Traffic Authority Land Acquisition plans were maintained in conjunction with groups of State Highway files or Freeway files for land acquisitions and progress with acquisitions files. The Department's Head Office (H.O.) created these files to manage land acquisitions across the State. Divisional Offices (D.O.s) created their own files to manage acquisitions in their regions. Additional records were placed on the Divisional Office files and separate working plans were created to track progress of the multiple acquisitions for infrastructure projects.

They were numbered merely for reference purposes with their Divisional Office (D.O.) Roll numbers. E.g. D.O. Roll 115. Some of the plans contain a Charting Schedule, which was a summary table of related acquisitions for the given stretch of road undergoing land acquisitions. This summary table provides Lot and Deposited Plan numbers, file numbers, owner names and purchase dates.

The plans provide references to the land acquisition files, which were classified numerically according to the locations of construction works.