In Van Gend en Loos v Nederlandse Administratie der Belastingen it was held that the provisions of the Treaties (and EU Regulations) are directly effective, if they are (1) clear and unambiguous (2) unconditional, and (3) did not require EU or national authorities to take further action to implement them.
In which case was it held that the provisions of the treaties are directly effective if they are clear, unconditional, and don't require further action by EU or national authorities?
Van Gend en Loos v Nederlandse Administratie der Belastingen