Judgment of the Court (First Chamber) of 9 September 2004 in Joined Cases C-184/02 and C-223/02: Kingdom of Spain and Republic of Finland v European Parliament and Council of the European Union (Directive 2002/15/CE — Organisation of the working time of road transport workers — Self-employed drivers — Legal basis — Freedom to pursue an occupation — Principle of equal treatment — Proportionality — Obligation to state reasons)