Pictured below is a buggy from the Mt. Victory, Ohio Amish settlement.  Notice the silver strips on the back that serve as reflectors at night.  These strips are complemented by lit lanterns that hang from hooks on the sides of the buggy (you can sort of see one of the hooks at about 2 p.m. to the right silver strip). But the buggies in this particular community do not display the orange safety triangle which has been the cause of contention among Swartzentruber Amish in some states.  These Amish are not Swartzentruber, just very conservative.  I have seen buggies with these same silver strips but also displaying grey reflective tape along the back border of the buggy.  I think reflective tape in that manner is pretty effective.  The orange triangle is bright and visible, but there are other ways to keep buggies visible in the dark.  The bottom line: however these court cases shape up, you have to be alert while driving Amish country roads at night! Do not speed, keep your eyes on the road, and use common sense.