@rusaym When you call new Vehicle, the constructor of car will actually lead to Vehicle, which people think means 'was constructed by'. It actually doesn't mean that at all. Prototypal inheritance is a complicated concept, and is very different to class based inheritance. I recommend reading this free book for a great explanation:
But regarding your question, you don't need to include that line at all for what you are doing.
:warning: dshgna already gave wearenotgroot points