This highway layer is intended for general reference. It includes highways classified as Interstate or Other Freeways and Expressways by the US Department of Transportation (USDOT) Highway Performance Monitoring System (HPMS) Federal-Aid System exempting small segments of highway around the cities of Ada, Durant, McAlester, and Muskogee. The data reflects the highway system as of 2020 and was originally created and made publicly available by the USDOT on February 29, 2022 and downloaded on February 21, 2024. To access the original data visit https://data-usdot.opendata.arcgis.com/datasets/c199f2799b724ffbacf4cafe3ee03e55/about