 The portion of the route between Bridgeville Highway and US 13 in Seaford is designated as part of the Nanticoke Heritage Byway , a Delaware Byway . DE 20 has an annual average daily traffic count ranging from a high of 34 @,@ 190 vehicles at the north end of Millsboro to a low of 3 @,@ 030 vehicles at the Shiloh Church Road intersection between Hardscrabble and Millsboro . The portions of DE 20 concurrent with US 13 and US 113 are part of the National Highway System . 
