In Zambia some roads are designated as numbered routes to help with navigation. There is a nationwide numbering scheme consisting of (also known as Inter-Territorial Roads), (also known as Territorial Roads) and . Current Roads Total: 91,440 km (2001) Paved: 20,117 km (2001) of which 6,779 km are trunk or main routes. Unpaved: 71,323 km (2001) (Some of the unpaved highways are graded laterite roads.)