I tested the thingy today, and had some problems with the "cutting-preventing engine". Forgot to save a replay though, but at least 4 attempts were cut short by the game saying that I was at an area where I shouldn't have been, while racing clearly on the track. Don't know if it was lag as the bars seemed normal and I didn't notice anything.
Ah, the SimFIA man. The colors are the way I see them on my captures, which is supposedly not what it should be in real life. Do you have the official color codes or are yours also assumptions?
Like Duke Toaster said, you can see that it is because of the engine limitations if you have gotten the "follower could not find position" error sometimes.