Is there an existing AI car system?

Sorry if this is kind of a dumb post, I know that this is probably a question that gets asked a lot by new developers.

But I’m wondering if any pre-existing solutions exist to making realistic traffic/ambient cars/vehicles driven by NPCs, like to act as a background detail for an open world game. Do any exist?

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I mean probably I believe I saw a post on one a while ago, but not as advanced as your asking for. I would say make your own you can’t get such a big part of a game to work from a free model really.

I just used the Search tool up top with the term “traffic NPC” and got these:
Simple Traffic System I Made In A Few Hours
How to achieve Vehicle AI that utilizes a chassis and follows traffic laws? - #5 by Scottifly