<p>During the Combine Demolition Derby at the Hillsdale County Fair in <a href="http://travel.nationalgeographic.com/travel/united-states/michigan-guide/">Michigan</a>, drivers of massive farm equipment clash in an intense, three-hour display of grinding steel, sparking engines, and shooting clouds of diesel exhaust. In 2008, the <a href="http://travel.nationalgeographic.com/travel/american-festivals/">American Festivals Project</a> was on hand to capture the event.</p> <p>Used on farms for harvesting grain, combines are specifically outfitted for competition—heavy and useless parts are removed, and the front of the vehicle is reinforced with additional bars and chains. If the front of the combine is destroyed, the vehicle is eliminated.</p> <p>Read more about the Combine Demolition Derby on the <a href="http://americanfestivalsproject.net">American Festivals Project blog</a>.</p>