Line 668 (Calabasas-Warner Center Circulator)
Line 161, without the extension to Agoura Hills and Westlake Village, combined with the southernmost portion of Line 245 on Topanga Canyon Blvd. and Mulholland Dr., with route deviation as needed. Briefly implemented in the early days of the Smart Shuttle demonstration project in 1997, and later partially used as basis for Line 645 as part of Metro Orange Line restructuring, implemented June 26, 2005.
- Originally proposed without Line 245 route segment or route deviation.
