Setting Up Permissive Signals In Yard Properly

[AdvancedApproach]

I have two yards on this route which includes locomotive staging points. These are where I keep my local and switching motive power when not actively in use. Only problem is when returning my AI drivers get stuck and notify me that they're waiting for access. This is with type 5 dwarf signals with number boards, which makes them permissive. How can I fix this problem? Using invisible signals have been of no assistance for me and actually have caused even more headaches. Here's an example:

 

[mtldrm38]

You do not always need to add a entry signal to every sidings...
A L5 yellow invisible signal is ok after the entry junction.
04 outbound signals are ok or invisible to keep the parked engine from controlling the entry junction...
From what I see you are attempting?

 

[norfolksouthern37]

I have been using the following or similar setup for a while and do not experience problems with AI drivers. Filling up a route with invisible signals is NOT a recommendation I would make, but I see it done a lot. I tend to try not to use an invisible signal unless it is in this context of a yard, where the exit signal offsets are used (<kuid2:45324:24900:6> JR Signal Offset), or in a case where this YD permanent restricting signal is used (blue triangle - <kuid2:45324:24012:1> JR Invisible Signal (Yard)).

 

[AdvancedApproach]

You do not always need to add a entry signal to every sidings...
A L5 yellow invisible signal is ok after the entry junction.
04 outbound signals are ok or invisible to keep the parked engine from controlling the entry junction...
From what I see you are attempting?

So take out signals on the yard tracks? How would I account for AI trains? I'm worried that could cause some unwanted problems. Do you have an idea on what should be done afterwards?