 DelDOT has replaced several at @-@ grade intersections along DE 1 south of Dover with grade @-@ separated interchanges . The intersection with DE 9 near Dover Air Force Base was rebuilt into an interchange in 2009 . In November 2009 , construction began for a grade @-@ separated interchange with DE 12 in Frederica ; the interchange was completed in June 2011 . In November 2012 , construction began on an interchange at DE 30 southeast of Milford . The interchange between DE 1 and DE 30 was completed in July 2014 . On January 31 , 2015 , groundbreaking took place for an interchange at Thompsonville Road north of Milford , with Governor Markell and DelDOT secretary Bhatt in attendance . Completion of this interchange is expected by winter 2016 . On November 9 , 2015 , construction began on an interchange at Bowers Beach Road in Little Heaven , with Governor Markell , DelDOT secretary Cohan , U.S. Senators Carper and Chris Coons , and Speaker of the Delaware House of Representatives Peter <unk> in attendance at the groundbreaking ceremony . Work on the interchange at Bowers Beach Road will build service roads to the east and west of the current route with a bridge carrying DE 1 over Bowers Beach Road ; construction is expected to last until 2018 . On March 18 , 2016 , a groundbreaking ceremony took place to build an interchange at Frederica Road south of Frederica , with Governor Markell , Senator Carper , and Kent County Administrator Michael J. Petit de Mange present at the ceremony . Construction of this interchange is expected to be finished in mid @-@ 2018 . 
