From Brady Haran's Periodic Videos blog: http://periodicvideos.blogspot.com/2011/05/testing-tandem-bike-rack.html
This bike rack was made extra long and easy to use for transporting on top of a car. It has some mechanisms that make it easy to load a bike on and off. The group made it for a student project/assignment, and they also crash tested it.
I think some of the mechanisms are a more complex than was needed, but it seems that they were purposefully added so that they would fulfill a requirement. I enjoy seeing how and what they were testing with the crash tests.
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