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Transportation

How Bright Headlights Escaped Regulation (autoblog.com) 153

Longtime Slashdot reader schwit1 shares a report from Autoblog: ... the problem is that the federal brightness standards for automotive headlights have not changed for decades. The Federal Motor Vehicle Safety Standard No. 108 hasn't had significant updates since 1986, with an addition allowing Adaptive Driving Beam (ADB) headlights coming only in 2022. The NHTSA last investigated (PDF) the issue of headlamp glare in 2003. The current standards include huge loopholes for auto manufacturers to emit as much light as desired, as long as the manufacturer meets the requirements of the other parts of the regulation.

LEDs can be made to focus light using lasers, and auto manufacturers use this ability to their advantage. The regulatory standard prohibits excessive light in certain areas by referencing old technologies, but manufacturers design the areas in question to be shaded so that the total light output can still be increased greatly overall. Manufacturers want as much light as possible in order to get a high score for the IIHS headlight safety ratings. [...] Although the U.S. finally approved the ADB technology in 2022, manufacturers are wary of implementing it because of conflicting regulations, with a few exceptions, such as Rivian.

To fix this problem, the first step is to update Standard 108 with a cap on the maximum allowable brightness for LED technology. Next, states should begin requiring headlight alignment inspection during vehicle inspections. Finally, NHTSA should enforce a ban against the sale of aftermarket LEDs that exceed the allowed brightness, at least for on-road use. The Soft Lights Foundation has collected over 77,000 signatures calling for federal action to limit headlight brightness. People are frustrated with being temporarily blinded while driving, and it's high time some regulation was put into place. Vehicles have become cleaner and safer through smart regulation; the same just needs to be done with headlights.

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How Bright Headlights Escaped Regulation

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  • by 93 Escort Wagon ( 326346 ) on Thursday January 08, 2026 @04:11AM (#65909649)

    We are NOT going to get any new even marginally consumer-friendly regulations during the next three years.

    • Re: (Score:3, Insightful)

      by misnohmer ( 1636461 )
      Or any time after. The previous administration directed the government regulators to make adaptive headlights level. They took two years to come up with a new standard, incompatible with what the rest of the world has been using for well over a decade, which could be enabled on cars driving around United States. They could have grandfathered in the global standard, then set their sights on making new regulations for the future, but no, they blocked everyone for a couple of years, then came back with new reg
      • by dryeo ( 100693 )

        Where I am, the inspections and then the smog test both got cancelled in the name of austerity with a smattering of freedom. And the cops, whose budget increases faster then any other local budget, claim they don't have the resources to stop people for things like burnt out lights. Tax cuts have consequences.
        As an aside, I just swapped some LED lights into my truck and quickly noticed that the daytime running lights, which use the high beam in series so run at 6 volts, now are fully on. I have to remember t

    • by mjwx ( 966435 )

      We are NOT going to get any new even marginally consumer-friendly regulations during the next three years.

      You might, but it will be despite your government rather than because of it.

      If other countries (EU, UK, JP, AU) et al. introduce regulations than global manufacturers will bring those to the US by default as it doesn't make economic sense to make modifications to a global platform for a single country. The same way many American cars are now European Emissions Standards (EURO 1-7) compliant for their model year. Simply didn't make sense to use a different engine for a single market.

  • by Viol8 ( 599362 ) on Thursday January 08, 2026 @04:20AM (#65909657) Homepage

    Headlights are way too bright and now with idiotic daytime running lights (useful in the artic circle, not so much in the med in the summer) it makes it MUCh harder to see oncoming motorbikes who used to stand out with their headlights on. Being narrow they're hard to see at the best of times but frankly, if a driver can't see an oncoming car or truck in bright daylight without headlights perhaps they need an eye test.

    • by Valgrus Thunderaxe ( 8769977 ) on Thursday January 08, 2026 @04:54AM (#65909683)
      DRLs have been proven to reduce accidents [dot.gov] everywhere they've been mandated, not just in the arctic circle.

      DRLs aren't the "bright headlights" this article is talking about.
      • tl;dr for the whole thing but I've seen similar studies to this that either completely ignore data from sunnier regions or, as this one appears to do, merge data from all over the place with no regard to location. So if DRLs decrease crashes by 10% in semi-gloom arctic regions but increase them by 5% in regions with more daylight, it's still a win even if it makes things worse for most of the US population.
      • In World War II, they experimented with hiding tanks by covering them with lights; the film of it was convincing. To me it seems that it all depends on the background brightness; that is, cars viewed against a bright sky (such as on the horizon) would be less visible. ...And if you can't see a behemoth coming in your direction then you aren't paying attention.

        People can turn on their headlights if they think visibility is poor. Such lights expend much energy, multiplied by millions of vehicles...ha
        • by kackle ( 910159 )
          cars viewed against a bright sky (such as on the horizon) would be less visible*

          *when using DRL
          • by dryeo ( 100693 )

            My experience is the opposite, especially if the Sun is low and the vehicle is a drap colour with grey the worst.
            It's hard to get people to turn on their headlights when the visibility is poor based on how many idiots drive around without their lights on in the rain.

    • False. Europe's regulations have a different problem. The regulations cover specifically that the bright beam can't shine into people's eyes, even reflectively, but fucks up how to achieve this. Mainly that the headlights are limited by beam angle. That is perfectly fine when everyone drives a hatchback, but not so fine when you drive a hatchback and the person behind you drives an SUV. The beam angle then allows their lights to shine in your mirror.

      In Europe it's not brightness that needs restriction, it'

      • by Viol8 ( 599362 )

        "Also I've never once ever been blinded by a daytime running light. Not sure what you're on about there."

        Never said they were bright, but they're related issues.

        • by shilly ( 142940 )

          In what way do they cause problems, in your view? I’m asking an open question, I’m genuinely curious. I’ve not personally found them problematic, but YMMV.

          • by Viol8 ( 599362 )

            Read my original post - they make it much harder to distinguish motorbikes in busy traffic.

            • by shilly ( 142940 )

              I did read your original post, but I don’t understand *how* DRLs make it harder to see a motorbike? Do you mean that if a motorbike is driving towards you in the opposite direction, and there’s a car behind it, it’s somehow more difficult to see the motorbike because of the DRLs? Or something else? I don’t doubt that you find there’s a problem, I just don’t yet understand what causes it to occur.

            • by jp10558 ( 748604 )

              Is this a Europe only thing? At least in the US DLR are mostly useful for the people who will not turn on their headlights till they need to see as dusk occurs. Un-disablable auto low beams would do the same thing. IDK why there are so many people who insist on driving almost in the dark with their lights off, but there are a noticeable amount. They also help (and auto lights would help) with people driving in cities with overhead lights and apparently again not realizing their lights are off when they driv

              • by tsqr ( 808554 )

                IDK why there are so many people who insist on driving almost in the dark with their lights off

                People who started their trip when the sun was high and end up continuing in the dark without headlights on do so because they're absent minded - it's an example of the "boiling a frog" phenomenon. Most of the instances I see occur in the evening rather than the early morning before dawn.

        • Oh I see what you mean now, misready your post.

          But the reality is DRLs improved safety. This is something that you yourself acknowledge since you complain now that motorbikes no longer stand out.

          if a driver can't see an oncoming car or truck in bright daylight without headlights perhaps they need an eye test.

          There are plenty of cases of subtle camouflage to say nothing of sudden bad weather onset / dusk. "Didn't see" is a cause of many accidents even among people with perfect vision. This is why DRLs were mandated, and why they objectively reduced the incidence of collisions on vehicles where they were introduced.

          Humans

      • False. Europe's regulations have a different problem. The regulations cover specifically that the bright beam can't shine into people's eyes, even reflectively, but fucks up how to achieve this. Mainly that the headlights are limited by beam angle. That is perfectly fine when everyone drives a hatchback, but not so fine when you drive a hatchback and the person behind you drives an SUV. The beam angle then allows their lights to shine in your mirror.

        In Europe it's not brightness that needs restriction, it's the beam angle needs to consider the height of the front headlight.

        Also I've never once ever been blinded by a daytime running light. Not sure what you're on about there. They are incredibly dim as you can see in any car when you turn them on at night and still can't see shit.

        Yes, the angle is the key. The highly focused headlamps kind of address that problem, but eventually fail big time. . You are correct about the different headlamp heights, and the fact that someone might be driving a Mini Cooper, while someone else is driving a semi truck, plus different heights relative toeach other.

        • Height. As in pickup trucks and their cousins, full sized SUVs, and the upper headlights being nearly exactly at the height of the eyes of drivers in smaller coupes and sedans.

          And lifted trucks, with headlights aimed directly into the rear windows of those smaller vehicles. As they must be, after all, being higher they need to be pointed down more profoundly to actually illuminate roadway in a useful fashion.

          When do we get some regulation preventing this direct illumination of other drivers, to their distra

    • by AmiMoJo ( 196126 ) on Thursday January 08, 2026 @06:03AM (#65909815) Homepage Journal

      DRL are fine. The issue is badly adjusted super bright headlights. Most people don't know that there is a switch to angle them appropriately, and the auto ones react too slowly.

      • by mjwx ( 966435 )

        DRL are fine. The issue is badly adjusted super bright headlights. Most people don't know that there is a switch to angle them appropriately, and the auto ones react too slowly.

        This has a lot to do with the height of new cars, as headlights need to be placed near the top of the bonnet if they were adjusted properly (as not to dazzle other road users) they'd be half invisible to the driver of the Panzer IV they're attending the steering wheel of.

        It's well past time that larger cars were re-classified as a different class of vehicle. (VLGV for the UK). That way it'd be easy for them to pay extra tax, higher penalties for driving infractions, bans for the really bad one, so on and

      • Angle of light projection dont mean anything in hilly areas, there is no perfect angle, even if you have a luxury car with auto level beams (BMW, etc). Also my new honda came with auto high beam (when it doesnt detect other head lights) enabled by default. Now I know why im randomly blinded by cars. I had turned off auto high beam so I dont annoy anyone. The LED lights are just too bright.
    • Daytime running lights help in the early evening when the sky is darkening but people have not yet turned on their headlights because they aren't legally required to do so until sunset.

      Be we really need clarity about headlight colors (too blue destroys night vision) and that annoying flicker that you can see in your peripheral vision.

    • DRL can be implemented in two different ways. Long story short, when they do it with the headlights it's good, when they don't it's bad.

      Headlights aren't too bright, they're too point-sourced. Specifically, some LED lights (without a diffuser) and all projector lights have bright spots which are the real problem, not the overall brightness.

      I put Beamtech LED capsules in my Versa. It has old cloudy headlights so there's no bright points, but there wouldn't be anyway because they are a classic reflector desig

    • Headlights are way too bright and now with idiotic daytime running lights (useful in the artic circle, not so much in the med in the summer) it makes it MUCh harder to see oncoming motorbikes who used to stand out with their headlights on. Being narrow they're hard to see at the best of times but frankly, if a driver can't see an oncoming car or truck in bright daylight without headlights perhaps they need an eye test.

      So many posts before we got to an actual on-topic non psycho-political one. Thank you for one that is relevant!

      This has nothing to do with Cheeto. It has been going on for years. It is the culmination of multiple problems.

      One of the biggest culprits is headlamp focusing. If Both vehicles are at the same level, no problem. If one is slightly lowe, they'll be in the area of focus. I've occasionally given someone the high beams, they return the favor, but their high beams then shoot over my head, at least u

    • by ceoyoyo ( 59147 )

      Daytime running lights are useless but they make vehicles stand out. Right.

  • The total light emission isn't the most significant factor regarding what makes headlights glaring. It's the size/area of the light source. When the Sun is behind a cloud, you can look at it directly .. and yet the surroundings/day isn't really any darker. Why? Because the brightness is spread out and no longer a point-source. If a car's entire front bumper was a diffusion sheet .. a car could emit a large amount of light and still not blind anyone.

    • by dsgrntlxmply ( 610492 ) on Thursday January 08, 2026 @05:03AM (#65909707)
      Another aspect is that white LEDs used in headlights, emit a much greater fraction of blue light than did old-school tungsten filament lamps. Shorter wavelengths give greater dispersion (blue sky) so worsen the contrast impairments from fog, mist, smoke, dust, windshield schmutz, and cataracts in the eye. This was at least as annoying with HID headlights, especially when applied aftermarket to jacked up bro trucks, with uncanny aim at rearview mirrors.
      • Oncoming headlights are a huge problem for me as I have cortical cataracts with spikes in my lens that create tremendous glare. This winter I am using yellow-tinted glasses which are a huge help.
    • That works if you optimizing for not blinding others rather than, you know, seeing well in the dark in front of you at a cone. And when it's cloudy, it *is* darker, I'm not sure where you live but I live in a country that's mostly cloudy and the difference is very much observable.
      • Angle matters. It doesn't matter if your headlight is a high powered laser, it only blinds the people if its pointed at them. The problem is universally where the lights are pointed. For most cars of the same size that doesn't matter. The problem is when you have a hatchback followed by an American abomination of an idiotic monstertruck (more colloquially known as an SUV, or a small penis compensation machine), the headlights are mounted too high in the first place and as such aren't angled down far enough

        • I don't disagree. And in slopes if you're going up you get screwed anyway regardless of the car type from the other lane, but at least that's not as common for most. For me the most effective approach to driving at night is with retroreflective paint and low-lights. Nobody's getting blinded, reduced light pollution and perfect contrast.
    • by ceoyoyo ( 59147 )

      When the sun is behind a cloud the surroundings are quite a bit darker. Many times. Overcast skies reduce illumination by 50-100x.

  • Manufacturers want as much light as possible in order to get a high score for the IIHS headlight safety ratings

    Why does the entire problem of bright headlights, appear to boil down to this nonsense?

    Ever thought about changing the IIHS safety ratings instead of blaming manufacturers who are literally chasing IIHS ratings? Why do the safety ratings, not have defined limits long before we’re fighting for defined limits?

    IIHS, what exactly do you DO here.

  • Next, states should begin requiring headlight alignment inspection during vehicle inspections.

    You don't have this already??? Here in the UK, headlight alignment has been part of the mandatory annual inspection (MOT) for as long as I can remember and certainly from way before the invention of LED headlamps.

    • You don't have this already???

      The US is quite like the EU in this regard: each state has its own independent driver and vehicle licensing authority, so they all do it differently, subject to some over arching rules.

      With that said, un the US the over arching rules are very weak.

      In NM, for example there's the annual inspection to make sure the emergency spare is installed on one of your wheels rather than stashed uselessly in the trunk, that the treads aren't too deep and to make sure your windscreen is adequ

    • No. In the USA even the very strictest inspection regimes are basically "is anything falling off" and they don't do real stuff like test your headlight aim or brake fluid boiling point. MOST people don't have any inspection requirements except emissions testing, and some states don't even do that.

      Here in California for example we have no safety testing, and a number of remote counties don't have to do regular emissions testing — only on transfer to a non-family-member, except for heavy diesel RVs whic

      • In Georgia, some counties require emissions testing, some don't. In New York, annual inspections were, if anything, too thorough. At least that's how I remember them. Too thorough, too expensive.
        • by jp10558 ( 748604 )

          I really never thought NY would have worse inspections than CA, but yea - we have emissions testing, all sorts of physical inspections - you can fail on torn wiper blades. In fact, I think it's a bit of a scam of the inspection garages to force you to buy cheap wiper blades at jacked up prices to pass you. Oh, and no CEL for any reason I think.

          The emissions testing is the worst though - we're way out in a rural area, and I think the number of cars junked cause fixing emissions (otherwise run fine) may well

      • In PA, it's not just the usual tests if the lights work and wiper tests, but also tread wear depth, brake pads worn out, and some under vehicle steering linkage and suspension checks. It's an actual roadworthy test.
  • It's possible that more glare causes less fatalaties than more glare prevents (not exactly the IIHS argument, but what it would be if they were honest). But shouldn't some weight be given to comfort?

    If I had a button to kill a decision maker in the car industry for this during a walk after dark, the fatality rate for modern headlights would skyrocket.

    • It's possible that more glare causes less fatalaties than more glare prevents (not exactly the IIHS argument, but what it would be if they were honest)

      IIHS-HLDI is a non-profit that is focused on reducing injuries, so saying if "if they were honest" doesn't make it true. Also, they examine the efficacy of safety related improvements, which means that the stats should indicate diminishing returns IF it were causing more injurious collisions than it was preventing.

      But shouldn't some weight be given to comfort?

      No. IIHS-HLDI is all about safety but if something were too uncomfortable then it would likely impact safety. Like I wrote above, they examine the efficacy of safety related improvements. However,

  • It's funny how driving habits vary per region vis a vis bright headlights. Up in the Northeast, when I drive my vehicle the oncoming traffic often flashes their high-beams thinking my high-beams are on and/or my lamps are misaligned (they are not).
    Here in the Mid Atlantic, nobody does anything.

    • I'm having a hard time interpreting that as anything but, "your headlights are too bright". Maybe people in the mid-Atlantic are less prone to telling you your lights are too bright, but it sounds like the Northeast has no such qualms.

      Stop blinding people.

      • Here in the mid-Atlantic flashing people with high beams on has become futile, it's every other damn car. Some even drive with them on in the daytime. It's a fucking epidemic of inconsiderate ignorance.
      • by kriston ( 7886 )

        Hahah, no, my headlights are perfectly aligned and are 100% in compliance.

        It's been over two decades like this.

        • Wait...
          Have you been driving the same car for 20 years? You must be way better at auto-maintenance than I.
  • The issue with super-bright LED headlights is that they technically pass a test due to having sharp cutoff but this does not reflect to real-life conditions where driving uphill or over bumps can raise that cutoff and blind oncoming traffic. The solution is self-leveling headlights that would respond by lowering (or raising) the cutoff (or entire headlight) in response to road conditions.
    • Yeah, too expensive to require by default. Maybe if the rule was, "if you want super-bright headlights, they must auto-level", but it shouldn't be applied to all new cars.
    • Yes, I've had that problem with my RAV4. It has LED headlights, and when I pack several hundreds pounds in the back, people assume I have my high beams on when I don't, So they flash their high beams at me, and I have to flash my high beams back to tell them to STFU.
  • also (Score:2, Interesting)

    children shouldn't be allowed to drive monster trucks

  • by chas.williams ( 6256556 ) on Thursday January 08, 2026 @09:20AM (#65910069)
    Just like you wouldn't download a car.
  • I just bought a new car and noticed the headlights seem obnoxiously bright. Is there a way to reduce the output on my own? This would ideally be a software fix that I can set through the cars instrumentation, but I am not opposed to soldering some current limiting resistors inline with the LED's.
    • Sorry, we're all screwed. Check the replacement price of the headlight assemblies on your new car - together they are probably 1/30th of the car's original cost.
  • I really don't like being blinded by oncoming traffic. There's nothing like not being able to look at the road because someone's low beams are brighter than everyone else's high's.
  • "LEDs can be made to focus light using lasers"

    What on earth are they talking about? Is this nonsense like I suspect, or does anyone know something about this?

    • by jp10558 ( 748604 )

      In this context I have no idea, but there are a lot of hobby laser engravers / cutters that use diodes (which I think are LEDs) in a certain system to generate a laser beam. I wonder if AI got confused writing that part of the article or something?

    • by ceoyoyo ( 59147 )

      It sounded like nonsense but I think they're talking about projection headlights that use mirrors and/or lenses to produce a particular illumination pattern. It has nothing to do with LEDs but LEDs are as magic as magnets to most people, including half of this comment section.

  • "Manufacturers want as much light as possible in order to get a high score for the IIHS headlight safety ratings. "

    At least be honest. The problem is people wanting super bright lights while concurrently not wanting to be blinded by other peoples super bright lights. You can usually sort out who has obnoxious lights and who doesn't just by color temperature alone.

    All of this nonsense about misalignment or the need for fancy technology to steer light everywhere but other drivers eyeballs ignores the plain

  • by kackle ( 910159 ) on Thursday January 08, 2026 @11:25AM (#65910341)
    I've thought of painting my car's rear to a mirror-like finish.
  • by msauve ( 701917 ) on Thursday January 08, 2026 @11:32AM (#65910371)
    Start by getting rid of fog lights. They do nothing but create more glare for oncoming drivers. They can't be used alone at night because they don't count as headlights, and using them along with headlights does nothing to reduce the light reflected back from fog.

    And there are lots of people driving around with them on at all times. They're obviously in a mental fog.
    • Fog lights are annoying and manufacturers aren't being controlled, some cars somehow manage to allow them even while the high beams are on (more than 4 forward facing white lights at one time is not legally allowed) - now that oncoming car is lit up like the sun.
  • by Locke2005 ( 849178 ) on Thursday January 08, 2026 @11:38AM (#65910395)
    Due to scars on my cornea from RK surgery (a very bad idea, in retrospect), I suffer from serious night blindness. Meaning when you come towards with bright lights, that is literally the only thing I can see... I can't see the road in front of me. I am literally driving blind until the headlights pass, and then driving almost blind for a while until my eyes adjust to low light again. So yeah, I don't like them, because they are literally trying to kill me!
  • by kencurry ( 471519 ) on Thursday January 08, 2026 @12:01PM (#65910481)
    Why do you have to burn my retinas out? I get it, you are going to stop.
    • by Luthair ( 847766 )
      I'd rather they target idiots with smoked tail lights that you can't see. Europe has a of better laws around lights: orange turn signals, fast blinking brake lights under hard braking, etc.
  • Indeed LED brake lights are bright, but they don't have enough area. Cars would be safer if they all had a similar brake light area. BTW, on most weeks here in the Silicon Valley, I find a motorist with a bad taillight, and tell them. Oddly, the newer LED tail-lights are not more reliable than the old bulbs, perhaps because of added complexity, such as CANBUS.
  • by BrendaEM ( 871664 ) on Thursday January 08, 2026 @01:43PM (#65910725) Homepage
    When you see only the corner of the rear of a vehicle during the day, you can see that it is indeed the signal light blinking--rather than its tail light.
  • I was riding as a passenger in my friend's Tesla (forget which model). And it apparently had a feature where it ran the high beams all the time unless the car detected a vehicle a certain distance in front of it. However, whatever that distance is/was is wayyyyyy too short. Because I kept saying: "dude, that guy on the highway a quarter mile away is totally getting blinded by you right now". And he was all "nah, the car knows best". To say nothing of opposing traffic in other lanes the car likely can
  • by kalieaire ( 586092 ) on Thursday January 08, 2026 @04:27PM (#65911161)
    It's a matter of perspective.

    In my area where we have a lot of ride share drivers and recent immigrants working in tech, I've asked a fair amount of them:

    * during the summer months when folks have their windows open when we're side by side at a light
    * waiting at the cellphone waiting area at airports
    * my own uber or lyft driver when I noticed their highbeams were on (7 out of the last 11 rides to and from the airport have had their high beams on)

    During the 30 seconds to few minutes of conversation of the folks I've talked to, a large majority say they use high beams because it's brighter on the road.

    They're all only looking at it from their own perspective and dgaf about anyone else since they're just trying to get through the day.  Literally working w/ blinders on.

    Also, none of them were aware that it was considered bad behavior on the road.

    A very small percentage are folks with either old headlights where it's fogged over the front so it scatters light everywhere or misaligned headlights after a car accident when it wasn't repaired to a professional level.

    ---

    If you shift things back a couple decades to the late 90s and early 2000s, the common excuse then (so sue me, i'm a chatter box) was that they have a headlight out and they're just trying to get home before they get to it the next day (for a year).

    My main point being is that maybe it's not the headlights themselves being the issue, but it's people are using high beams when they shouldn't be.  For a lot of readers, and even people in general, it's a difference people don't care to distinguish they just want to blame someone or something. Headlight manufacturers using projector and LED matrix technology give really good cutoffs to prevent from deliberately blinding people, and they work well.  The only thing people think is "I'm blind".  Also complainers that answer these surveys where market research specialists get their data are typically older with poorer night vision and really bad cataracts so light scattering is at an order of magnitude greater than what young people see.

    Younger people don't have time to answer surveys. lmfao. They really just have better things to do.
  • I find the modern headlights to be really bright if they're coming at you, but you can barely tell they're on if you're the driver. Maybe because as a driver everyone else's headlights are ruining my night vision. So aside from not having to replace sealed beams/halogen bulbs all the time, i don't see the benefit. Someone tell me they improve vision at night. My old sealed-beam pickup truck lights up the road in front of me better without blinding anyone.

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