Illinois Department of TransportationDesignated Truck Routes - State Jurisdiction Truck Route. Permits are issued for all loads that exceed the current legal limits specified by state law. Highway Designations. The Department of Transportation may designate streets or highways in the system of State highways as follows: Class I highways include interstate highways, expressways, tollways, and other highways deemed appropriate by the department. Class II highways include major arterials not built to interstate highway standards that have at least 11 feet lane widths. Non-designated highways are highways in the system of State highways not designated as Class I or II, or local highways which are part of any county, township, municipal, or district road system. Local authorities also may designate Class II highways within their systems of highways.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/8ac9cb665cc54b68bbda023299ab7bb5_85engIllinois DOT Open Data PortalPublicDesignated Truck Routes - State Jurisdiction Truck Route [Illinois]Web servicesIllinoisLast Modified: 2021-02-16