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  • how many way do city use to limit cars use
    4
  • what causes traffic on highways
    uneccercery braking
  • what gase causes asthma and cancer
    hydrocarbon
  • what gasas emmited from car
    soot carbon monoxide carbon dioxide sulfur dioxide
  • why are self drive cars better than nomal cars
    they can maintain steady distance and speed
  • what contributes to global warming
    carbondioxide
  • what causes traffic
    humans
  • how many cars are excpected to add on in 2050
    1.2billion
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