How headlights got brighter, whiter, and more blinding after dark

According to 2019 to 2023 Fatality Analysis Reporting System (FARS) data, 46,154 fatalities on US roads were due to crashes at night and in non-lit areas. 446 were due to glare impeding the driver’s vision. At the top end of the data set, the clustering of fatalities in California, Texas, and Florida is broadly consistent with baseline exposure: they are the three most populous states and, by extension, host the largest absolute number of vehicle miles traveled, so their prominence is not especially surprising. Illinois and Indiana likewise track expected behavior given their placement among the nation’s more populous states. More notable are the outliers further down the list, where states such as Alabama and Kentucky exhibit disproportionate fatality counts that are less easily accounted for by population alone and appear, on first inspection, anomalous relative to traffic volume. But the distribution becomes more legible when cross-referenced with demographic structure. A significant share of recorded fatalities, 108 in total, occurred among drivers aged 65 and older, suggesting that vulnerability factors tied to age may be amplifying outcomes in certain jurisdictions. This reframes Florida’s position in fifth place, where its unusually large elderly driving population likely acts as a multiplier, helping contextualize why Texas and California remain in the upper tier. Alabama, meanwhile, remains a persistent outlier, retaining the highest relative fatality burden even when normalized against population size, indicating that exposure alone does not fully account for its placement in the distribution. US federal headlight brightness standards have remained largely unchanged since 1997. In 2022, however, the US finally allowed adaptive driving beam headlights. The 1997 system effectively reset industry incentives. Only one of more than 80 headlight systems tested in 2016 earned a “good” rating, but by model year 2025, that figure had risen to roughly 51 percent, with “marginal” or “poor” systems falling from 82 percent to about 16 percent. As for maintenance, most cars, especially earlier halogen models, would require bulb changes. Depending on the vehicle, this was generally as simple as popping the hood, removing a cap from the back of the headlight, and changing the bulb. Now, if an LED cluster malfunctions, the entire unit must be swapped out for another, due to much tighter tolerances in LED sources compared to halogen counterparts. As for headlight alignment, the higher intensities and contrasts of LED lights mean greater sensitivity to misalignment than halogen lights. And there you have it: an unromantic explanation for why night driving now feels like a low-grade assault on your retinas. Modern lighting systems are undeniably better than what came before—brighter, more efficient, and far more capable—but, as ever, those gains come with trade-offs. Headlights are still evolving; they’re now supported by cameras, sensors, and software that’s supposed to handle the tedious work of switching between low and high beams—or better yet, shaping the beam itself so you’re never blinding other drivers while still being able to see the road. In theory, it’s elegant. In practice, it’s a computer trying to interpret a fast-moving, low-light world in real time, deciding whether that reflective flicker is a cyclist, a sign, or just the universe messing with it. And for all their confidence, computers still hesitate in slightly unnerving ways. Object recognition can be imperfect, beam adjustments aren’t truly instantaneous, and the entire system depends on a stack of assumptions about what a system thinks the road is doing at any given moment. It usually works. Right up until it doesn’t. It’s a bit like a Roomba, which will happily clean most of the floor, navigate around obstacles, and declare victory with robotic satisfaction. But it will also miss the awkward corners and stubborn patches that require a human to step in with a more old-fashioned approach (in this case, manually turning off the blinders). On a good day, modern headlights can take most of the cognitive load out of night driving. But are we comfortable delegating yet another slice of real-time judgment to a system that is still learning how to see in the dark?