Correct cristianyxtl! Excellent intuition. With those strings you can vary the size of the icons, from traffic lights to speed, poi and traffic icons. But I think the user was looking for something different: the smaller poi icon based on distance. If we set the zoom for the then large icons to 500 max, starting from a "normal" view, we get something similar which, however, is not linked to the distance but rather to the zoom of the map. Obviously, the intervention is useless if you then use different views (Far or Near). Excellent found anyway because it allowed me to change the size of the traffic lights (which for my tastes were a bit small). But for the distance I know that we have to look elsewhere ..