I have confirmation from the project manager that the interchange project will remove the traffic signal on southbound DE 1 at the
quarry entrance. All northbound access will be eliminated there and the southbound side will be converted over to a right-in/right-out.
Northbound trucks going to the quarry will use the Dover AFB interchange to turn around, while trucks coming out of the quarry to go north will use the new interchange at DE 9 to U-turn.
As for the new interchange at DE 9, the manager said it should be open to traffic sometime in the next few weeks. It's more or less a standard diamond interchange (albeit with curves in the ramps instead of straight ramps). The overpass over DE 1 is right at the old location where Kitts Hummock Rd
split off from DE 1. Kitts Hummock Rd is being realigned to meet DE 9 just north of the interchange.