Here are the booking photos (click to enlarge) of the eight members of an Amish sect who were ordered jailed by a Kentucky judge after they refused to pay fines for failing to affix orange safety triangles to their horse-drawn buggies.
(btw - Another thing most Amish avoid: having their picture taken)
Seems to me some sort of compromise could have been reached on the triangle sign controversy. There is nothing especially alarming about a triangle shape, and the colors don't especially alert you to trouble. Anything that makes the buggies more visible would work.