I just recently purchased a brand new Ford Escape. My fiancee and I were traveling back to my hometown; she was driving the escape and I was driving my old car which I was selling to a friend.
While driving behind the escape on the interstate I noticed that the rear bumper had a rippling effect across its face from what must have been air being forced up inside. I was a little concerned because I would have thought it was aerodynamically engineered for the air to flow around the bumper. Am I right to be concerned or is this natural?