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My opening post, as an observer sitting still, I suspect there was a yaw component, and if observed at double speed in head on passing, yaw interaction would be likely twice as fast and not humanly discernible. Also, in my opening comment, to restate, a large "dirty" vehicle seemed to have less on an "impulse wake" then a smaller more aero vehicle. Again this did not seem to be intuitive or logical, but I also need to clearly state, it was far from anything from scientific observation. That puzzlement was my motivation for sharing.
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