exactly bro. I'm not going to make road signs......I'm sure you see these signs all over your town & they aren't illegal.
Depends what the rules are for the city you are placing them. We do this for our business and some cities are cool with it, others have Code Enforcement drive around pull them and issue tickets to the owners. Plus placing it on city property versus private property cus you can never know where the property line actually is unless you have the city plans.
It can bring in traffic though im sure just from people who are curious, but I dont know about conversions.