The victim was a 78-year-old Delaware City man. His name is being withheld by police pending notification of family.
The accident in the southbound lanes happened shortly after 6:30 a.m. in front of New Castle Airport.
Two northbound lanes remained closed until 7:15 a.m. but all southbound lanes remained closed. DelDOT reported all southbound lanes reopened at 8:45 a.m.
Police said the victim stepped into the path of a tractor-trailer driven by John Davis, 60, of Westville, New Jersey. Davis was not injured but was taken to a hospital as a precaution, police said.
After the man stepped into the roadway, police said, Davis braked and swerved in an atempt to avoid him but the man fell and was struck.