Article 42. Suspension of the Validity of Driving Permits

1. Contracting Parties or subdivisions thereof may withdraw from a driver the right to use his domestic or international driving permit in their territories if he commits in their territories a breach of their regulations rendering him liable under their legislations to the forfeiture of his permit. In such a case the competent authority of the Contracting Party or subdivision thereof withdrawing the right to use the permit may:

    (a) Withdraw and retain the permit until the period of the withdrawal of use expires or until the holder leaves its territory, whichever is the earlier;   
    (b) Notify the withdrawal of the right to use the permit to the authority by or on behalf of which the permit was issued;
    (c) In the case of an international permit, enter in the space provided for the purpose an endorsement to the effect that the permit is no longer valid in its territories;
    (d) Where it has not applied the procedure for which provision is made in subparagraph (a) of this paragraph, supplement the communication referred to in subparagraph (b) by requesting the authority which issued the permit, or on behalf of which the permit was issued, to notify the person concerned of the decision taken with regard to him.

2. Contracting Parties shall endeavour to notify the persons concerned of the decisions communicated to them in accordance with the procedure laid down in paragraph 1 (d) of this Article.
  
3. Nothing in this Convention shall be construed as prohibiting Contracting Parties or subdivisions thereof from preventing a driver holding a domestic or international driving permit from driving if it is evident or proved that his condition is such that he is unable to drive safely or if the right to drive has been withdrawn from him in the State in which he has his normal residence.