 In July 1987 , construction began on the first segment of the freeway between US 40 in Bear and DE 273 in Christiana . In 1988 , the US 13 Relief Route was given the DE 1 designation . DE 1 was extended from its northern terminus in Milford to follow US 113 between Milford and Dover and US 13 between Dover and Tybouts Corner . Construction on the freeway between US 13 in Tybouts Corner and US 40 in Bear began in March 1988 . In August of that year , groundbreaking took place for the section of the DE 1 toll road between Dover and Smyrna . Construction commenced on DE 1 between DE 273 and I @-@ 95 in Christiana in August 1990 . The first section of the DE 1 freeway opened in August 1991 between US 13 in Tybouts Corner and US 40 in Bear . Three months later , the freeway opened north to DE 273 in Christiana . 
