From ArborWiki

AATA Route 4, the Washtenaw bus, runs between Blake Transit Center and the Ypsilanti Transit Center. It is the most heavily traveled route in the AATA system, and thus runs the longest with the most stops. It runs every 30 minutes on the weekdays, every 15 minutes during peak times.

Notable stops include:

• Arborland
• Eastern Michigan University
• South University
• University of Michigan Hospital