Those are the last shortcuts you'll see on this course. Otherwise, leave this at default or turn it down one notch. He's a big fan of imports and goes out of his way to take on the big blocks. Times between tollbooths are generous, so floor it and you shouldn't have any trouble. Given that not all of the stock cars appear on the map for unlocking as you progress through the game, I'm betting that these are just the ones that didn't show up as you played through.
nest...