Terms and Descriptions
Under KRS 177.020 the State Primary Road System classifies state-maintained
roadways by the type of service and function they provide. 603 KAR 3:030
designates the following classes :
State Primary System: Interstates (symbolized
by black lines on maps), parkways (brown lines) and other long distance,
high volume intrastate routes (red
lines) of statewide significance that generally link major urban areas
within the state.
State Secondary System: Regionally significant
routes (green
lines) of shorter distance which provide mobility and access to
land use activity, generally serving smaller cities and county seats within a
region.
Rural Secondary System: Routes of sub-regional
significance (yellow lines)
which might include urban arterial streets and other collectors, often with
access to land use activity such as farm-to-market routes as their main
function.
Supplemental Roads: All other state-maintained
routes (purple lines) such as frontage
roads, cross roads and local access roads such as farm-to-market routes
as their main function.
