How to create cars moving automaically on the road

I am a complete beginner. I don’t know coding(may learn if helpful). I want to create cars moving automatically on the streets. We can crash our car onto them, enter them, etc. similar to GTA V. Please anyone help me onto it. Please tell all you know.

It’s a complex system. To have cars moving themselves, you have to make an AI controller and then possess the car pawn, while to have players entering cars, you have to play an animation and attach the player to the car, then change the possessed pawn to the car.