See halfsack's comment. To elaborate on that point, actually good & competent drivers have many responsibilities. Among them is to see....and be seen.

As others have said, a lot of these buggies are all black. And they're puttering around the road, on a dark nights, well under established speed limits. 2 vehicles traveling at very different speeds, the slow one is hard to see. That's just begging for an accident.

At least where I live, it is technically illegal to drive without headlights on when it's raining. If windshield wipers are required, so are headlights. This is to bolster visibility in poor weather conditions. Also just headlights in general, you can get pulled over & ticketed for driving at night without headlights. Why should the Amish be a dangerous exception to the rules of the road??

This alone: Roads funded by taxpayers, which IIRC the Amish are largely tax-exempt. Thus: if they wish to travel on our roads, they need to abide by our rules & not make the roads more dangerous.

To be slightly more accommodating to Luddites, we could put hi-vis reflective tape on the buggies. But again as others have said, the Amish have all kinds of workarounds/exceptions/justifications to get what they want. They have mobile phones. Some have snowmobiles. They have generators, so they're not "tied into the worldly grid" but they generate & use electricity. So maybe they can get used to the idea of battery-powered lights on their buggies, for visibility.