   Highway markers for Interstate 75, U.S. Route 60, and Kentucky Route 1 | |
| Highway names | |
|---|---|
| Interstates | Interstate nn (I-nn) |
| US Highways | U.S. Highway nn (US nn) |
| State | Kentucky Route nn (KY nn) |
| System links | |
| |
The Kentucky Revised Statute 177.020(1)[1][2] provides that the Department of Highways, a part of the Kentucky Transportation Cabinet, is responsible for the establishment and classification of a State Primary Road System which includes the state primary routes, interstate highways, parkways and toll roads, state secondary routes, rural secondary routes and supplemental roads. These routes are listed below.