DE 1's traffic volumes are higher. That said, DelDOT has plans to build 3 interchanges in the coming years along US 113, at DE 20 West (2023, includes a connector east to DE 24), DE 404 West (2024), and DE 16 (2027).
Slightly, but not to a large extent. Both corridors are comparable. US-113 is also a regional corridor, DE-1 is a local connector to the beaches and Lewes.
They'd been pushing for a limited access highway between Milford and the Maryland line comparable to that of the DE 1 tollway. Local opposition got it canned though, which IMO was pretty short sighted. Sussex County is going to continue to grow regardless of whether the highway projects that'll make that growth bearable get completed.
What a joke. The corridor should've been built out to the same design DE-1 is north of Dover, all the way south to Maryland, whether on entirely new location (put another toll on it), or partially upgrading the existing route / building new town bypasses. It's a shame some local opposition causes an entire corridor to be scaled back or removed, largely political driven ultimately. The corridor is needed to handle existing and future regional volumes, and a viable alternative for not only US-113, but also US-13.
At least they got the corridor north of Dover right.
An expressway design (free-flow, no signals) is planed in some areas it seems, but with the volumes the road handles during peak weekends and in the summer in general, full limited access is warranted. The local opposition is the same group of people that have to deal with turning onto a highway (where no signal or proposed interchange exists) with heavy, dense 70+ mph traffic, which is a significant safety hazard. It's not some lightly traveled corridor where spot upgrades are acceptable.