In 1997 I attended an entrepreneur presentation about a newly patented technology where modulated headlights were a safety feature [0]. The inventor was an aging engineer and noticed he had a hard time seeing the road surface at night. Apparently a good fraction of the driving public, especially older people, have lost the ability to see the road surface well in the dark. He read about the scanning effects when a scene is illuminated from side to side, which interacts with the human visual system and makes the surface of the road rather more visible. He built a simple system to modulate his headlights side to side. He even took some people for a ride that night to demonstrate the effect. (I didn't go.) It seemed like a potentially great idea, and I would ping the inventor from time to time about his progress in getting his "Winkers" into production. He never seemed to be very focused on his invention, and finally explained he was busy "sending a letter to every member of Congress about the AIDS hoax"[1]. I didn't contact him after that...

[0] https://patents.google.com/patent/US5536975A

[1] https://en.wikipedia.org/wiki/HIV/AIDS_denialism