A construction of metal with sharp edges when undone from how it has been fit together. Containing several gallons of an extremely flammable fluid culled from ancient dead lizards. Its velocity far outstrips the speed with which a human being can run and for far greater periods of time. Thus, convenient. Unfortunately, it is difficult for human beings to run out of its path. Also, unfortunately, there are often more than one of these vehicles on the roads at any given moment. Fortunately, cars function efficiently at culling the weak, lame, or distracted from the herd. Thus is the greater good served.