An open listing generally brings the same result to a landowner. If you engage several agents to help you sell your property, then no one is responsible for marketing and selling your property. By making it open to everyone, you essentially make it for no one. Why would an agent spend money advertising a property that they have no reasonable guarantee that will produce a return on their investment? When they do, sellers often get the impression that the agent has nothing to offer and is not effective. Good agents will not do that as a standard practice.
You mentioned that the adjacent development already is “underway” and that the developer recently sold 92 lots. This makes me wonder why the developer would be coming to you now about roadway frontage for a turn lane. Usually the road improvement plan is in place prior to the subdivision being formally approved and recorded and the developer secures rights to all of the land it needs for turn lanes in advance. The existence of lots in this development suggests that the road plans already should be approved. Get information from your local planning or subdivision department (as applicable, or possibly the DOT) and see if you can find the plans for offsite road improvements for this subdivision. It’s possible that there was a lapse in the planning process — or that the original roadway improvement plans have expired if the project was abandoned during the downturn — and the need for land for a turn lane has recently come to light. Do your research to understand the facts.
First impressions are lasting in real estate. When selling a home you would never leave out your dirty laundry for potential buyers to see, and you should also clean up your lot before it is shown and marketed. Cut the grass (or weeds), remove trash and take marketing photos of your property when it is looking its best. Some sellers even plant wildflowers to make their vacant land look beautiful. It’s like staging a home, but you’re just working with raw land instead.