The car of Google Maps making its way through the parade taking pictures for Street View:
See the result on Google maps:
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"On May 3rd 2008, artists Ben Kinsley and Robin Hewlett invited the Google Inc. Street View team and residents of Pittsburghs Northside to collaborate on a series of tableaux along Sampsonia Way. Neighbors, and other participants from around the city, staged scenes ranging from a parade and a marathon, to a garage band practice, a seventeenth century sword fight, a heroic rescue and much more...
Street View technicians captured 360-degree photographs of the street with the scenes in action and integrated the images into the Street View mapping platform."
The Making of "Street With A View"