- A gentle ramp would descend from the greenway to the tunnel, open to the sky, cutting the tunnel in two with natural light.
- The tunnel would be expanded in width.
- Corners would be rounded so you could see what was there.
- Stores (Jugo Juice?) could built into the walls to provide more security as well as a refreshment spot for pedestrians.
- Cyclists would be required to dismount and walk through underground areas.
UPDATE: See Gordon Price for an idea on what to do on the North side.