| http://www.w3.org/ns/prov#value | - three wheels are guaranteed to always be on a plane, but four wheels are not (its basic highschool geometry)the rocker design makes sure all four wheels always remains on the ground even if the terrain is bumpy.this is a problem with all vehicles with more than 3 wheels, such as cars (the car suspension is required to keep all four wheels on the ground)my four wheel omni wheel robot (http://www.so
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