yeah you can see the cars cutting corners. what i suspect is that at the start, or at some point in the race their tracker stopped working, and when it picked back up is where the line goes straight to. if you play back you will see the line that is cut, is perfectly straight like an arrow. there is no way to actually physically run that type of line across 25 miles of desert, so i assume it was the GPS system drawing a straight line from the time their tracker stopped to the point at which it began tracking again.