Traffic class

class Traffic {
  import java.util.Map;

  int carNum;
  int[] speedArray = new int[carNum];
  Car[] carArray = new Car[carNum];
  private Map cars = new HashMap();

  Traffic(int tempCarNum, int tempSpeed){
    carNum = tempCarNum;
    for(int n = 0; n < speedArray.length; n++) {
      speedArray[n] = tempSpeed;
    }
  }

  void createObject() {
    for(int i = 0; i < carNum; i++) {
      carArray[i] = new Car(30, 300, color(255, 0, 0), color(100, 255, 100), 10, true);

    }
  }

  void addCar(String carID, Car car) {
     cars.put(carID, car);
  }

  private Car getCar(String carID) {
    return cars.get(carID);
  }
}