Greetings!

Is there a method to ensuring vehicles (NPCs) will not yield to vehicles with yellow lighting? For example, I downloaded a tow truck and a security vehicle, and changed their class to utility (not emergency), so the siren no longer functions and the lights work with the horn key, however NPCs are still yielding to these vehicles.

 

I've read through the meta files, and can't find any settings that would cause this. Any recommendations?

Did you look in the carvariations for sirenSettings and switch that to 0?