Underpass Lighting

San Antonio - IH37 Underpass
http://www.publicartsa.com/flip/index.php?option=com_k2&view=item&id=16:light_channels

'Moodwall' in Amsterdam, many more pictures at the link
http://www.cube-architecten.nl/projecten.htm

See Moodwall in Action:

http://www.youtube.com/watch?v=hr1VopbCWOI

A proposal for Philadelphia.
http://philly.brownstoner.com/2010/09/an_interactive_lightscape_for_1.php

Melbourne, Australia. Not an underpass, but a similar installation
http://www.lightmoves.com/projects/craigieburne.htm