Ethan May and Justin L. Mack | IndyStar

Dwight Adams/IndyStar

Photo courtesy of The Satanic Temple Indiana Chapter

Drivers may find themselves looking twice after reading a newly posted sign along a stretch of U.S. 421 in Boone County.

The Adopt-A-Highway sign put up Tuesday lists the group that works to keep it clean: The Satanic Temple Indiana Chapter.

The organization posted a picture of a sign on its Facebook page Monday with the hashtags #HailIndiana and #HailSatan.

The post also included the hashtag #InvertedCrossroads, which is the name of the temple's highway adoption campaign. An inverted cross is a commonly used Satanic symbol.

The sign could be around a while: INDOT communications director Debbie Calder said they ask groups taking part in Adopt-A-Highway to make a two-year commitment.

The section of U.S. 421 adopted by the group is northeast of Zionsville, and just south of State Road 32 in rural Boone County.

In a news release announcing their campaign, the group said it has had the idea to do the service since the chapter's January founding. Members completed the group's first clean-up of the two miles of road on July 8.

At the time, leaders told IndyStar that the highway adoption is an effort to build toward a more inclusive state and encourage others to do good within their communities.

According to INDOT's website, the Adopt-A-Highway program "coordinates with community groups that provide trash and litter pickup on two-mile segments of non-interstate Hoosier highways."

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The state department supplies safety training, vests, road work signs and vests for the groups that do the work, INDOT's website says. But groups are not paid, nor do the groups pay INDOT for the recognition.

When asked whether the state vets groups that wish to adopt a highway, Calder said "INDOT has to be respectful of the First Amendment rights of all groups that wish to participate in this program."

Sections of highway can only be adopted by one group at a time, and INDOT works with groups to assign an area near where they would like to work, Calder said.

Adopt-A-Highway is separate from the Sponsor-A-Highway program that allows individuals or organizations to donate money toward the hiring of an INDOT-approved group that will clean areas around the road.

Call IndyStar digital producer Ethan May at 317-444-4682. Follow him on Twitter @EthanMayJ.

Call IndyStar reporter Justin L. Mack at 317-444-6138. Follow him on Twitter: @justinlmack.