User:Mecheyethe4th/sandbox2

The Cook County Highway System is a county-maintained system of arterial county highways in Cook County, Illinois, United States. They are only occasionally marked with the standard M1-6 pentagon-shaped highway marker either on the base of traffic signals at intersections or on their own poles. They are not marked on any freeway or tollway exits or signed with separate reassurance markers, nor are they marked on any maps.

Currently, The Cook County Highway System constitutes roughly 578 miles of roads designated as County Highways. . The below list was referenced from the map provided by the Illinois Department of Transportation as well as the interactive GIS map provided by Cook County Department of Transportation and Highways.

Cook County, like Lake County, Boone County, and McHenry County, use a system of numbers and letters to name their County Highways. The system was developed to replace the previous system developed in 1913 which was essentially assigning letters to routes arbitrarily. The new system developed in 1959 uses the letters A through Z to indicate how close to the Wisconsin state line (For east-west running routes) or to the Mississippi River (For north-south running routes) the route originates, with A being the route closest to its respective boundary and Z being the furthest away, followed by a number from 1 to 99 to provide more designations per letter.