Looks like somebody started a page on this old plan related to I-96:

https://en.wikipedia.org/w/index.php...Atta_Connector

Does anybody have documentation of this? If so, please edit the article, which is in danger of deletion.

I wasn't able to find anything formal.

Admins: Since there doesn't appear to be a "Mid Michigan" forum, I posted this here, but feel free to move it if you can think of a better place.