Are you trying to make the car go to a part? Using a model and welding it to a NPC will make it have some extremely sharp turns.
Extreme turns are demonstrated in this video: https://www.youtube.com/watch?v=IHSZIg3Q94M - You’ll notice that when making a U-Turn, it is an extremely sharp turn.
I created a car that essentially follows a part and finds the angle between the part and the car and drives towards it. Are you looking for something like this: AI CARS.rbxl (148.2 KB)
Note: This does not use the pathfinding service given by Roblox.