Area and Point places for Interchanges, Exits and Junctions are NOT used in Wisconsin for normal mapping. The exceptions are only for large construction projects and micro-places for special notes to editors about the location.
When dealing with a construction project, place an area over the entire zone, but stay as close to the road boundaries as possible. Name the area the interchange name and append Construction Zone (or the official project name if there is one). Example: Zoo Interchange Construction Zone. In the description, put as much info about the project as you can including relevant websites or wiki pages. Lock the place at 3 (or contact your Area Manager or State Manager to uplock for you)
See Wisconsin/Places for guidance in Wisconsin that may not be universal to all other states and territories.