Highway Boundary (RedLine)

This dataset is refreshed on a weekly basis from the datasets the team works on daily. Please note that this dataset is indicative only. For queries about this dataset please contact the GIS and Research Team. Last update date: 26th June 2026 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), and plots 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.本数据集基于团队每日运维的数据集，每周进行一次更新。请注意，本数据集仅为参考性质。若需咨询本数据集相关事宜，请联系地理信息系统（GIS）与研究团队。最后更新日期：2026年6月26日。 国家高速公路运营公路边界（RedLine）数据集绘制了全战略道路网（SRN）范围内的公路所属土地范围。该数据集包含两个图层：其一为边界轮廓图层，其二为构成该边界的土地的登记状态与类别图层。 由于与地方公路管理局（LHA）道路衔接的相关流程限制，本数据集内的土地可能涵盖地方公路管理局道路——即产权归国家高速公路所有，但由地方公路管理局负责养护的道路对应的土地。剩余土地或为未来项目预留的土地均不包含在本数据集内。 本公路边界数据来源于以下数据源：英国地形测量局（Ordnance Survey）主地图地形数据、英国土地登记局（HM Land Registry）国家多边形服务（仅涵盖国家高速公路产权地块），以及红线边界项目期间经研究与数字化处理的地块。 该边界被划分为多个类别，用于说明针对特定地块的判定结果，类别详情如下： 自动红线（Auto-RedLine）类别：指基于英国地形测量局主地图地形数据，通过自动化流程生成的地块。此类土地未以国家高速公路名义完成登记。示例包括但不限于：未完成登记的、归属于英国高速公路局（Highways England）的“古老”公路，或公路跨铁路桥梁对应的土地。 红线内国家高速公路产权（NH Title within RedLine）类别：指源自英国土地登记局地籍地块，且产权所有人为国家高速公路或其前身机构的地块。此类土地要么处于公路边界范围内（已完成审计），要么达到算法设定的特定阈值。 红线外国家高速公路产权（NH Title outside RedLine）类别：指与上述类别生成方式一致，但被判定处于公路边界外的地块。当置信度为低时，此类土地尚未完成审计；当置信度为高时，此类土地已通过审核，被确定不属于本机构的运营边界范围。 国家高速公路技术人员数据（National Highways (Technician) Data）类别：指由国家高速公路团队生成的数字化地块，对应未登记、尚未登记或无法登记的公路用地。 隧道内道路（Road in Tunnel）类别：基于英国地形测量局主地图地形数据中的隧道轮廓生成，对应英国高速公路局路网内的隧道。此类土地未以国家高速公路名义登记，但隧道上方的土地可能归属国家高速公路产权。请以英国土地登记局保存的最终土地权属登记记录为准。 流程属性用于说明针对特定地块的判定依据，详情如下： 自动化（Automated）类别：指通过自动化流程生成的数据，此类区域尚未由本机构完成审计。 已审计（Audited）类别：指已由本机构完成审计的数据。 技术人员数据（待审计）（Technician Data (Awaiting Audit)）类别：指由国家高速公路团队生成，但尚未完成审计并确认为最终版本的数据。 置信度属性用于说明判定结果的可靠程度，该属性同时基于底层自动化数据集构建过程中的判定结果，以及对应路段是否已由国家高速公路工作人员完成研究和/或审计。具体分类如下： 高（High）置信度：指该地块有极高概率处于红线边界范围内，此类区域通常已完成审计，或为紧邻公路、位于公路之上的设施。 中（Moderate）置信度：指该地块大概率处于公路边界范围内，但待对应区域完成审计后，判定结果可能发生变更。 低（Low）置信度：指该地块处于公路边界范围内的可能性较低，此类地块通常为英国高速公路局已登记的土地，但自动化流程将其标记为公路边界外区域。