public boolean Decrement()
    {
        //set the status flag of offboarding a passanger
        boolean status = false;
        
        //ensure there are passengers on the bus
        if ((passengersOnBoard - 1) >= 0)
        {
            //decrement passenger onboard
            passengersOnBoard -= 1;
            //set the status flag for the off boarding of a passanger
            status = true;
        }
        
        //return the status of offboarding a passenger
        return status;
    }