There's a fellow in California who loves bumper cars so much, he's developed a small fleet of them modified to be street-legal there. For photos, more information, and comments, see:
http://jalopnik.com/5344771/street-legal-bumper-cars-prove-world-is-a-beauti
ful-place/gallery/ [2]
http://www.benchrace.com/html/8.35.html [3]
http://www.flickr.com/photos/mr38/sets/72157622677941791/ [4]
http://nowthatsnifty.blogspot.com/2009/11/bumper-cars-turned-into-real-cars.
html [5]
Links:
[1] http://www.library.northwestern.edu/libraries-collections/evanston-campus/transportation-library
[2] http://jalopnik.com/5344771/street-legal-bumper-cars-prove-world-is-a-beauti%3Cbr%20/%3Eful-place/gallery/
[3] http://www.benchrace.com/html/8.35.html
[4] http://www.flickr.com/photos/mr38/sets/72157622677941791/
[5] http://nowthatsnifty.blogspot.com/2009/11/bumper-cars-turned-into-real-cars.%3Cbr%20/%3Ehtml