[genewitch]

I don't understand how a car with detectors that dim mirrors can't also turn your high beams off when they detect another car in front of you.

Easily 5/8ths or more of every vehicle I pass at night has their high beams on, and in areas without fog lines it gets old in a hurry - and dangerous.

[hadlock]

This technology exists in Europe, it's not allowed in the US due to very specific wording about headlight laws here, but very recently regulations were changed to allow for it. Not sure if it was in the infrastructure bill that already passed, or the follow-up one they're currently trying to pass. Most BMW (and probably Mercedes, Audi etc) with adaptive LED lights built after ~2017 have the hardware for this for use in international markets, and could probably be retrofitted with a firmware update unlocking it for use in the US market.

[clort]

This technology is not great on a windy[1] european road though. I rented a car recently and noticed that it was auto-dipping but the problem is it dips once it has detected the oncoming vehicle. That is fractionally too late as the driver has already been dazzled. Manually, I would dip the headlights just before the car came into view because I could see the headlights looming.

[1] a road with lots of turns, not one where the wind is blowing

[jagger27]

“Winding road” is a nice way to disambiguate from gusty.

[kube-system]

Auto high-beams is absolutely allowed in the US and common on new cars. I've had a couple cars with this feature.

[hadlock]

My current car has auto high beams. Beam shaping is different technology, rather than a boolean operation, it allows the computer to turn off specific LEDs that are pointed at oncoming traffic, leaving the road ahead of you fully illuminated without blinding oncomming traffic

[kube-system]

The GP specifically referred to a vehicle that would "turn your high beams off"

[stronglikedan]

> it's not allowed in the US

My MDX does it, and they have had that capability since at least 2017.

[sbradford26]

I believe the tech that is not allowed in the US is something that literally dims sections of the lights that would shine line into the eyes of an oncoming driver. This is different than the auto dimming lights feature in US cars that just shuts off the high beams when an oncoming car is detected. Most of the tech is made by a company called Gentex. If you have an auto dimming rear view mirror in your car they most likely made it.

Press release about the feature I am referring to: https://ir.gentex.com/news-releases/news-release-details/new...

[Symbiote]

This article has pictures; perhaps easier for a quick overview: https://www.manufacturer.lighting/info/162/

[hermitdev]

> I don't understand how a car with detectors that dim mirrors can't also turn your high beams off when they detect another car in front of you.

Some can, though I have no idea on how common it is. My 2013 Dodge can do this. Unfortunately, it's also pretty terrible at it, resulting in a lot of on, off, on again, not quite flashing. e.g., a slight bend in the road, it doesn't seen anyone if front, turns high beams on, only for the road to bend back and all of a sudden your brights are shining in someone's face as the road bends back again. Sometimes, I've seen even changing lanes be enough for it to turn brights back on again. It also doesn't seem to give as much consideration when following someone as leaves them on way too close for me.

I live in an urban enough area with plenty of street lighting anyway, so I tend to use the auto high beam feature almost never (it can be toggled with a position of the turn signal lever). I do, however, use the auto-on lights in general, though. Nice to just not have to worry about turning lights on (or off).

I've also been pulled over before for flashing my brights at a police officer. It was entirely unintentional, though. I was a relatively new and young driver (17 or 18 yrs old at the time) and I was driving an older vehicle that still had a foot operated switch for the high beams that tended to stick.

[progman32]

Where do y'all live? That doesn't seem to be the case here in the Seattle area. I've noticed modern cars' headlight look like high beams sometimes, even on the low beam setting.

[t0mas88]

BMW does "automatic high beams" in Europe, they turn on when there are no cars ahead or opposite and off when it detects a car through the cameras. I've had it since 2006, so it probably existed a few years before that.

[sgtnoodle]

Our 2020 GMC Acadia and the equivalent Ford Explorer both automatically turn high beams on and off depending on nearby traffic. It's presumably based on a forward looking camera in front of the rear view mirror.

[wwalexander]

This feature is present in at least a couple of Toyota’s newer models that I’ve had the chance to drive (specifically a Prius Prime and RAV4 Prime).

[nereye]

Ford Edge (US market) has this too when in 'automatic' mode for the lights. It seems to work reasonably well though it sometimes lags a bit so other drivers probably find it somewhat annoying.