Family members also do not use their standards on road vehicles, either privately or during official engagements (when more discreet cars are used, such as Jaguar) or state occasions (when the Liveried cars of the Royal Mews are used), this seems reserved for the Queen only, although when Prince Philip travels alone at state occasions, his standard flies from the roof of his car, as seen with the funerals of Diana, Princess of Wales (when the Queen Mother also flew her personal standard from her car) and that of the Queen Mother, also, when a visiting Head of State on a state visit uses a car from the Royal Mews, his/her own flag is displayed. That said, when abroad, the standards of members of the family may well be flown: examples include Prince Charles, the Duchess of Cornwall and Prince William.<ref name="post">