 Delaware Route 1 ( DE 1 ) is a 103 @.@ 02 @-@ mile @-@ long ( 165 @.@ 79 km ) state highway in the U.S. state of Delaware . The route runs from the Maryland border in Fenwick Island , Sussex County , where it continues into that state as Maryland Route 528 ( MD 528 ) , north to an interchange with DE 58 in Christiana , New Castle County , where the road continues north as DE 7 . Between Fenwick Island and Dover Air Force Base in Dover , Kent County , DE 1 is a four- to six @-@ lane surface divided highway with occasional interchanges . The route heads north past the Delaware Beaches along the Atlantic Ocean before it runs northwest through rural areas , turning north at Milford to continue to Dover . Upon reaching Dover , DE 1 becomes the Korean War Veterans Memorial Highway , a four- to six @-@ lane freeway that is tolled . Between Dover and Tybouts Corner , DE 1 parallels U.S. Route 13 ( US 13 ) , crossing over and featuring interchanges with it multiple times . Past Tybouts Corner , the freeway heads north to Christiana , reaching an interchange with Interstate 95 ( I @-@ 95 ) a short distance before its terminus . 
