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Driving after dark used to be a haven. Late at night, there’s no rush-hour traffic, just the meditative hum of the passing miles. But these days, my eyes can’t take it anymore. Even on a lonely road in the middle of the night, I can’t seem to escape the glare of obnoxiously bright headlights. A pickup truck tailgating me blinds my rearview mirror with searing headlights. Even at a distance—and even when without the brights on—the beams of a vehicle in an oncoming lane make me instinctively squint. America’s roads are now full of tactical-grade headlights, and no one is happy about it. Just look at any of the viral screeds in the Reddit forum “r/fuckyourheadlights.”
Other people’s lights are a pet peeve nearly as old as the automobile: Everyone’s beams are too bright, too aggressive, and purposefully pointed into your eyes. But the problem really is worse than ever, and that’s because of the LED headlights that have taken over car design during the past decade or so. Not only can they crank out more lumens than the halogen lamps of old; their light is also sharper and bluer, which makes it feel like an assault on the eyeballs. Car companies have an incentive to install bright headlights that make drivers think Oh man, you can see everything, Jonathan Elfalan, the director of vehicle testing at Edmunds, told me. The wincing driver in the opposite lane isn’t their problem.
Across the world, high-powered headlights are far less menacing. That’s partly because of America’s obsession with crossovers, SUVs, and pickup trucks. New cars are taller and bigger than ever before, which means they are blasting light everywhere but down at the road ahead. “There’s a pretty good chance that the car behind you is shining its headlights right into your mirror,” Sean Tucker, a managing editor of Kelley Blue Book, told me. Still, other countries have long had something we don’t: high-tech headlights that can brilliantly illuminate the road in front of them without simultaneously burning another driver’s retinas. Although American cars are loaded with technology—plenty of new models now come with self-driving features and AI assistants—we’ve been missing out on a simple feature that would ease the problem of blinding headlights.
This technology is called “adaptive driving beam,” or ADB. Adaptive beams scan the road ahead of you and adjust accordingly: On a curvy stretch, the lights will track the road rather than shining straight ahead. They also can detect cars coming your way and dim just the light that’s pointed right at your fellow motorists. This is possible because an LED headlight is not a single light bulb that’s on or off but is made of a multitude of individual pixels. Adaptive beams have been popular in Europe for more than a decade and are in use in Asia and Canada. In the United States, just a handful of vehicles have them.
Blame the often strict and strange world of American car regulations. Decades ago, the National Highway Transportation Safety Administration mandated that cars need to have separate low and high beams. Adaptive beams—which are variable in nature—don’t fit into that binary. Congress finally amended the rules in 2021, a move meant to legalize the better method. That didn’t happen. NHTSA got to write the new regulations, and instead of adopting the international standard, it drew up a separate set of stricter rules. (An NHTSA spokesperson pointed me to the stance that the agency outlined a few years ago, which says that Europe’s test for adaptive bulbs lacks the “objective performance criteria” necessary for approving car tech in the U.S.)