Trade restriction

However, the term is controversial because what one part may see as a trade restriction another may see as a way to protect consumers from inferior, harmful or dangerous products.

[1] This law was struck down in 1987 by the European Court of Justice, but is still voluntarily followed by many German breweries.

[2] Rectangular headlamps were promoted in the United States where round lamps were required until 1975.

Glass-covered headlamps, like those used on the Jaguar E-Type, the pre-1968 VW Beetle, the Porsche 356, the Citroën DS and Ferrari Daytona, now had to be equipped with uncovered headlamps for the US market, further altering the look of European models sold in the United States.

The change meant that vehicles designed for solid aerodynamic performance could not achieve it for the US market.