Agreements, decisions and concerted practices of all or part of the members of one or more liner conferences are hereby exempted from the prohibition in Article 85 (1) of the Treaty, subject to the condition imposed by Article 4 of this Regulation, when they have as their objective the fixing of rates and conditions of carriage, and, as the case may be, one or more of the following objectives: (a) the coordination of shipping timetables, sailing dates or dates of calls ...