Thanks for attempting to steer the discussion back on track.
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I reviewed the footage (much of which I shot) and you should realize that while some crashes/contact is shown, the race is one part entertainment. We pull out the exciting parts and compile the video so you get a taste of the action, but crashes are not as common as you may think. It should also be mentioned that these vehicles are slapped together at hackerspaces, usually using whatever free or cheap parts we can find, and are not precision machines. The endurance portion of the race is 75 minutes long, which really puts these vehicles to the test. Motors overheat, the vibration of driving shakes controllers loose, batteries wear out. There is some serious engineering that goes into these things, though you might not see it in a short promo video.