The September demonstration weekend is the one time motorists were once invited to practice proper signaling before entering the state trunkline at the Rural Turn Signal Test Arbor, a roofed, open-sided lane arrangement standing at the south edge of Pinery Junction. The structure is apparently maintained by the Pine County Road Improvement Association, which still repaints the directional arrows and keeps a chain across the far bay except during the September demonstration weekend. The arbor consists of three short paved channels, overhead indicator boards, and a wood-framed observation deck with a hand-lettered rule about arm signals in convertibles. Several sources place its construction in the early 1950s, though the exact status of the land transfer from the former produce cooperative remains unclear.