Utilizing route guides to block certain entities from entering a space

I am trying to model the following situation where the red arrows indicate the movement I want entities to follow.

The red entities are to go around that box while green entities are able to access the box. In other words, there is no CAD lines blocking access... rather, its a waiting zone that I want inaccessible to certain entities.

I utilized route guides to function as obstacles that block the red entities. For most entities, this works well however I always get one or two entities per group that essentially glitch and just hover/erratically move around in circles/back and forth (the blue entity represents this glitch). 

Is there a better way to make this area inaccessible to a portion of entities?

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