Passenger cars have emerged as the primary means of family transportation, with an estimated 1.4 billion in operation worldwide. Some subsystems have come about as a result of factors such as air pollution, safety legislation, and competition between manufacturers throughout the world. Some of these consist of thousands of component parts that have evolved from breakthroughs in existing technology or from new technologies such as electronic computers, high-strength plastics, and new alloys of steel and nonferrous metals. The modern automobile is a complex technical system employing subsystems with specific design functions.
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