The DOT has an online meeting for a small project on US 169: “installation of traffic signals at the I-80 ramp terminals along with turn lanes.” This is on the north side of the town of De Soto, and based on a quick look, it appears that these are the first stoplights in town.
The turn lane, as seen on the PDF, is mostly about southbound 169 (from Adel) to westbound 80. That would also be the US 6 traffic movement.