Table of TxDOT Linear Referencing Methods (LRM) contained in the Geospatial Roadway Inventory Database (GRID). All on-system highways are represented along with their TxDOT Districts, TxDOT Counties, Control Section and Milepoints, Reference Markers and Displacements and Distance From Origins. Mileage Reference Marker Equivalency (MPRME) is useful for translating highway centerline location between the LRMs. Used by the Design Construct Information System (DCIS), the Mileage Query System (MQS), the Crash Records Information System (CRIS), Pavement Analyst (PA), and the Maintenance Management System (MMS). Update Frequency: Frequently (monthly and annually)Source: Geospatial Roadway Inventory Database (GRID)Security Level: Public

A statewide point dataset of Texas Reference Marker locations maintained by the Transportation Planning and Programming Division of TxDOT. Reference Markers are extracted from the Geospatial Roadway Inventory Database (GRID), where they are maintained as an asset. Reference Markers are located along all on-system (i.e. state maintained) Texas roadways at 2-mile intervals, with the exception of interstate highways, which have markers at 1-mile intervals. Reference markers are used as a linear referencing system for project planning, asset management, and as a location reference in the field.Update Frequency: 1 MonthsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/04/24]