Case C-28/09: Judgment of the Court (Grand Chamber) of 21 December 2011 — European Commission v Republic of Austria (Failure of a Member State to fulfil obligations — Articles 28 EC and 29 EC — Free movement of goods — Measures having equivalent effect to quantitative restrictions on imports and exports — Transport — Directives 96/62/EC and 1999/30/EC — Sectoral traffic prohibition for lorries of over 7,5 tonnes carrying certain goods — Air quality — Protection of health and the environment — Principle of proportionality — Consistency)