The northernmost segment of 7.10 miles (11.43 km) runs from Mount Nebo State Park to AR 22 in Dardanelle.

[2] A third segment runs 11.16 miles (17.96 km) from AR 10 near Casa to Petit Jean State Park.

Highway 155 winds down the mountain on eleven hairpin curves with very steep grades, as much as 18% in places.

As a result, the route is a popular destination for motorcycle riders, and trailers and RVs over 24 feet are prohibited in the state park.

AR 155 continues to wind through forests before terminating at Highway 154 in Petit Jean State Park near the historic Seven Hollows Site.