National Roads in Kenya are the main highways of the classified road network. They are managed by the Roads Department of the ministry facilitate mobility on a national scale. Traffic on the roads is associated with long distance travel and their designs allows for high speed and minimal interference from crossing traffic.

Further classification is based on function. Class A are international trunk roads linking international boundaries or terminating at international ports, Class B are national trunk roads that link provincial headquarters and centres of national importance. Classes C are primary roads linking district headquarters to one another or to higher class roads