This is really, really cool! There is a video below as well.
“Created by artist Chris Burden, Metropolis II (2010) is a complex, large-scale kinetic sculpture modeled after a fast-paced modern city. The armature of the piece is constructed of steel beams, forming an eclectic grid interwoven with an elaborate system of eighteen roadways, including a six-lane freeway, train tracks, and hundreds of buildings. 1,100 miniature toy cars speed through the city at 240 scale miles per hour on the specially designed plastic roadways. Every hour, the equivalent of approximately 100,000 cars circulates through the sculpture. “The noise, the continuous flow of the trains, and the speeding toy cars, produces in the viewer the stress of living in a dynamic, active and bustling 21st Century city.”