It is signed as National Route 468 as well as C4 under the "2016 Proposal for Realization of Expressway Numbering.

From here the expressway is concurrent with the Shin-Shōnan Bypass, which it splits from as that road turns toward the south at Chigasaki.

It crosses the present east end of the Chiba-Tōgane Road, a two-lane expressway.

[5] In Chiba Prefecture, land acquisition is under way for an 18 kilometres (11 mi) gap in the expressway to be filled.

[6] Along with Japan National Route 16, the Ken-Ō Expressway will connect the entire length of the Technology Advanced Metropolitan Area (TAMA) — an inland industrial region covering an area of 3000 km2, in 74 municipalities, and home to over 10 million people of whom 4 million work in the TAMA firms.