MAYFIELD, Ky. (AP) — The American Civil Liberties Union will defend a group of Amish men in Kentucky charged with not displaying slow-moving vehicle emblems on their horse-drawn buggies.

The trial scheduled in Graves County has been delayed to September to give ACLU attorney William Sharp of Louisville time to prepare.

Sharp will defend seven Amish men who were charged with not displaying state-mandated flashing lights and an orange triangular symbol.

The men contend using the emblems and lights would violate their religious beliefs that prohibit possessions that are too worldly.

"We're interested in the case from the context of the Kentucky constitutional right to the free exercise of religion," Sharp said. "We believe the Kentucky Constitution actually provides greater protections than the federal constitution to exercise his or her religion."

Kentucky statutes have required symbols on slow-moving vehicles since 1971. The requirements for lights and flashers were added in 2005.

In February, three Amish men from western Kentucky were convicted and fined for failing to display the lights and emblem, but they are appealing.