Hey there @AngelisDead! Sounds like you’re looking to make a custom collision channel. This allows you to completely ignore collisions so no hit event can be processed at all. So first thing, you need to go into your Project settings and search “Object”, first thing you should see is this. I made an example, AIcars.
After that, on your AI cars you can set them as that channel, set up their collisions as custom, then ignore pawns or world dynamic and bam players won’t be able to contact them. Alternatively you could just go to the player as well and also just ignore any AI cars it overlaps with.
Let me know if this helps!