I hired a new car with Intelligent Speed Assistance this summer, though it was set (and I left it) just to "ping" rather than do any limiting. I drove it to a fairly unusual place, though still in Europe and with standard European signs. It did not have a GPS map of the area.

It could reliably recognize the speed limit signs (red circle), but it never recognized the similar grey-slash end-of-limit signs. It also didn't recognize the start-of-town or end-of-town signs, so it didn't do anything about the limits they implied.

I would certainly have had to disable it, had it been reducing the acceleration in the way that document describes.