Article 11
1. Without prejudice to Article 5 of this Regulation, Governments and undertakings shall, at the request of the Commission, supply any additional information which may be needed concerning any tariff, or formal or other agreement on transport rates and conditions. 2. The Commission may set a time limit of not less than one month for the forwarding of such information. 3. If the Commission requests an undertaking to supply it with information the Commission shall immediately notify the Government of the Member State in which the undertaking has its seat by forwarding a copy of the request for information to that Government. 4. Information may be refused if it involves the disclosure of any facts which a Member State considers would be contrary to the essential interests of its security.