 DE 20 has an annual average daily traffic count ranging from a high of 37,522 vehicles at the Middleford Road intersection along the US 13 concurrency in Seaford to a low of 5,240 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.What would become DE 20 was originally an unimproved county road in 1920, with the portion between Seaford and Concord under contract as a state highway.