Are they GA DOT signs or ones put up by neighborhoods?
There are weight restrictions and size restrictions for residential streets as well as bridges and overpasses as marked. But global "No Thru Traffic" - unless its an official GA DOT sign its not something I'd pay much attention to frankly.I think they can enforce no thru trucks. Within reason. Semi's aren't supposed to use Buford Dam Rd but they do it quite regularly, and the county will cite them. I've seen neighborhoods request the local authorities block off a road completely. But as far as arbitrarily closing a public road, nope.
From what I researched, there is no official GDOT sign for No Thru Traffic...How would I know if it's a GDOT sign? They're nothing but white and rectangular with "NO THRU TRAFFIC" in black letters on them.
They are installed by the city.Well that clears that up. GDOT only handles the numbered highways. Short of completely blocking the road I don't think there's any way to enforce it.
They are installed by the city.
The signs are installed as a deterrent, but the police have no authority to enforce it. It boils down to a matter of the public's constitutional rights to travel on public roads.