Bonzai automobiles

If you are have studied structural designing in your graduation, you will be aware of the things that go into developing a structure, be it automobile, or an aircraft. A prototype of proportionally lesser size than the original is made and is tested for failure. This is how, the actual design is tested for effectiveness. For example, model ships are tested in self-made turbulent sea conditions to check how well they navigate. Now, there are also companies that make such designs on order, since the actual manufacturing company can save the trouble of making a one-piece model to just test the effectiveness.