Describe the Suggestion

Something that would be nice to have, is some kind of advanced signal box that can display four different lighting states of clear, approach medium, approach, and stop the closer a train gets to another train in a signal block. This would be most useful for human operators.

Here's a diagram I found that illustrates what I mean:

Screenshots and Videos

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Additional Context

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Note that this becomes complicated when there are diverging tracks between these signals. Some way to indicate what signal is next would be necessary.

I think that 4 states might be a bit too much. Taking from Factorio, I would feel that 3 would be easier to understand and implement.

• Red - the current block is occupied.
• Yellow - this block is free, but the next block is occupied.
• green - this and the next block are free.

I think it should allow players to customize the signal rules, because the signal rules are different in every country.