Should Amish buggies continue to wear orange and red warning placards?

Recently, in rural Kentucky, several Amish men have been cited for failing to display the orange and red slow-moving placard on their black buggies. Several Amish men have served jail time over this law, stating that it “decorates their buggies and against God’s will”. There have been numerous traffic accidents involving buggies without the warning placards. Some Amish men plan on appealing their case to the Kentucky Supreme Court. Question: who is correct in this law, that requires Amish black buggies to wear the slow-moving orange and red warning placard, on the back of their buggies?

Source: AP