[freedomben]

Do those actually work? How widely are they deployed? Newer LED headlights seem particularly blinding to me as a driver on the other side.

[cjrp]

Becoming common on most VAG cars for example, even Skoda (their budget-ish brand) - see the video here https://www.skoda-storyboard.com/en/press-kits/skoda-superb-....

I think they're pretty effective; they cut out the light beam exactly where the other car is. There might still be reflections from other surfaces though.

[pandaman]

They work but not in the US, where they are illegal (the HW is capable of "anti-daze" but SW is locked out for the US cars).