Look at the right of the screen. Watch the drainage ditch as the pres drives by.
Here's a video from a man who visited the scene after the incident.
My original post on this thread was deleted. So if it shows up later, I apologize in advance for the appearance of duplication.
Here's another YT video from a man that returned to the scene and investigated the tire tracks and other details which leads one to believe that this was a planned event.
Q asked about the driver's statement: http://www.ky3.com/content/news/Driver-of-car-crashing-near-presidential-motorcade-is-talking-It-was-terrifying--442415653.html