With this simple (but long-running) modification, all barriers that block the path to another part of the state in the early days of the game will get a highlight (you can see the work of the modification in the screenshot). The highlighting algorithm is taken from GTA VC.
I think this way these barriers will become more alive, otherwise they are like some kind of statues without it.
In version 1.01, a check was added to see if a player exists in the game world. This is done to prevent crashes. Version 1.0 is no longer supported.