The southernmost part of the Korean War Veterans Memorial Highway, from south of DE 10 to north of Bay Road, was placed under construction in 1990 and opened along with the Dover–Smyrna portion of DE 1 in 1993. US 113 traffic needed to use a temporary tie-in during construction, and after the new freeway opened, traffic on the U.S. Highway needed to use Exit 95 to transfer between the new freeway and Bay Road. The extension of the DE 1 freeway south through Dover Air Force Base was constructed later due to the need to coordinate negotiations with the military installation and to allow the base to remediate hazardous material sites, maintain security and access restrictions with construction of a new Main Gate, and reconstruct base housing on the west side of the highway. The Main Gate to Dover Air Force base was moved further east, and a diamond interchange was built between the Main Gate and the base housing area. The upgrade of US 113 and DE 1 through the military base was built in two phases, the first from 1996 to 1998 and the second in 1999 and 2000.