public void addCarWaitTime(double time) {
    	if(time < 0) time = 0;
        if(carStats.getSize() == 0) {
            carWaitMin = time;
            carWaitMax = time;
        } else {
            if(time < carWaitMin) carWaitMin = time;
            if(time > carWaitMax) carWaitMax = time;
        }
        carStats.addDataPoint(time);
    }