nikexd

To the OP,
 
I experience what you describe exactly. It turns out it is because the game runes on a frame basis rather than time basis. This means the AI calculations are based on how fast your CPU is rather than basing it on a fixed time interval.
 
forums.bakabt.me/index.php?topic=23086.0
 
I found this thread and it explains it perfectly. I had the exact problems you had which I didn't notice before when I was playing with my old CPU. Now, I have these problems you describe. Reason: a i5 2500k running on 5.0GHZ.
 
Solution: Slow your CPU down by throttling it or somehow cap your FPS using VSYNC or other software.
 
EDIT: I tried various FPS caps. It seems like anything over 90 FPS causes AI issues such as; spawning on incoming traffic, zapping to other lanes instantly, stopping when you are near for no reason, going out of the road in a wierd way etc. Just use a software to cap your FPS to at most 90 and you should be fine. You can do this via MSI Afterburner, Nvidia Inspector or various other ATI and Nvidia tools.