Description: Mile Markers - System 1 Roads (INDOT), 2015 - Shows mile markers for System 1 roads that include Interstates, U.S. Highways, State Routes, Ramps, Institutional Roads (roads in state university properties, state hospitals, Indiana National Guard properties), and roads in properties owned by the Indiana Department of Natural Resources and maintained by INDOT. Each Reference Post point Inventory is placed as to Position, Measure, and by Reference Post Name. The posts are "names" for known spots on the road. The names are sequentially numbered along the road. The Reference Post point Inventory is Dated as of 2006-2015. The data set was compiled by Road Inventory of the Indiana GIS Department of Transportation (INDOT).