++++ 1 . OBLIGATIONS OF MEMBER STATES - FAILURE TO FULFIL AN OBLIGATION - EXAMINATION BY THE COURT - LIMITATION TO THE INFRINGEMENT EXISTING WHEN ACTION BROUGHT ( EEC TREATY, ARTICLES 169 AND 171 ) 2 . OBLIGATIONS OF MEMBER STATES - FAILURE TO FULFIL AN OBLIGATION - REASONED OPINION OF THE COMMISSION WITHIN THE MEANING OF ARTICLE 169 OF THE EEC TREATY - SUFFICIENT STATEMENT OF REASONS 3 . QUANTITATIVE RESTRICTIONS BETWEEN MEMBER STATES - 'STANDSTILL' OBLIGATION - ABSOLUTE NATURE THEREOF ( EEC TREATY, ARTICLE 31 ) 4 . TRANSITIONAL PERIOD - PROTECTIVE MEASURES WITHIN THE MEANING OF ARTICLE 226 OF THE EEC TREATY - CONDITIONS FOR AUTHORIZATION 5 . TRANSITIONAL PERIOD - PROTECTIVE MEASURES WITHIN THE MEANING OF ARTICLE 226 OF THE EEC TREATY - UNILATERAL ACTIONS OF MEMBER STATES - PROHIBITION 6 . QUANTITATIVE RESTRICTIONS BETWEEN MEMBER STATES - ELIMINATION - DEROGATIONS PROVIDED FOR IN ARTICLE 36 AND PROTECTIVE CLAUSE OF ARTICLE 226 OF THE EEC TREATY - ESSENTIAL DIFFERENCES