I am not sure where people get the signs they need for their farms. NC law states that in order to be protected by liability protection laws you have to post a sign or signs stating the law. The agri tourism association has their law available as a sign when you join, which I did. However the new law states it must be posted as well. All I could do was go have one made. I guess the good news is its a really nice sign mounted on a metal board so it should last a long time. Also fortunately for us there is only one way on and off the farm so its easy to post a sign that everyone sees which makes life simpler.
Seems like there is a business opportunity for someone to sell ready made signs for farmers.