Hiding signals in the map

Tired of the mess of bulbs in the map? As long as you can decide which signal class is the more important, here is cheap help.

If you give an argument outside the range of 0 to 2 to the system call Set2DMapSignalState, the signal is not shown, simply. 0, 1, 2 are green, yellow, red respectively. I have not found a way to show anything else for a signal. But at least, I know how to hide these bubbles.

Now if you have 3 stop arms of a semaphore (mounted on separate dolls), you could hide those showing red. Then you have yellow for any arm open with distant arm closed, green for any clear with distant arm also announcing clear, or nothing if all arms show stop. This, of course, is a bit sad, but there are some track diagrams that do work like that. There are others that don't, but better no red than a mess.

Even better if you have a main signal and an auxiliary signal like a call-on arm. Then you can work out their roles redictively, like main signal only shows clear, call-on arm show -- well, yellow? -- when open or red.