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Not quite right. They became common due to a combination of aerodynamics and lamp height restrictions. Especially in the US, which used to require one of a small list of sealed beam designs which weren’t at all aerodynamic. They are still technically legal, but difficult to integrate with protrusion restrictions. The US also dropped the sealed beam restriction decades ago, so there wad no point in trying.
Not quite right. They became common due to a combination of aerodynamics and lamp height restrictions. Especially in the US, which used to require one of a small list of sealed beam designs which weren’t at all aerodynamic. They are still technically legal, but difficult to integrate with protrusion restrictions. The US also dropped the sealed beam restriction decades ago, so there wad no point in trying.