Even if the beam shapes are perfect: old anti-glare regulations limit the intensity of light that goes above the horizon and with the technology of the time tha

Even if the beam shapes are perfect: old anti-glare regulations limit the intensity of light that goes above the horizon and with the technology of the time that implied a certain limit to below-horizon intensity. Which was still tolerable when the car hit the occasional bump, peeked over a hilltop and so on. But with LED and improved mirror designs, we can make the contrast at the cutoff line much bigger and now technically regulation-adhering cars can be devastatingly blinding whenever the road surface is not perfectly horizontal.