[Doogle]

...perhaps letting them paint a reflecting paint sign on their buggies would solve this dispute....seems other Amish in other states have no problem using the familiar triangle

[HiTech RedNeck]

A gadget with rotating vanes which, at the throw of a lever either shows plain black or the standard orange triangle, might be copacetic with some Amish. It might be flipped to the “gaudy” position for Caesar’s roads, and flipped back to all-black for off-road use.

[Joe 6-pack]

"...perhaps letting them paint a reflecting paint sign on their buggies would solve this dispute...."

Yep...I was thinking a reflective hex sign...