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That is great and all, but the wake looks the same on the both the bus and the streamliner.
Just after a good rain on a humid day, you can see the mist kicked up behind vehicles quite well. In fact, you can clearly see a vortex 'tornado' just behind the cab on semis that are not towing a trailer. The mist flows over the cab and then goes UP in a circular vortex just behind the cab.
( Surely some of you other guys have seen this as well ! )
I think this, and perhaps a light snow are best at flow vis. I guess the dust is too light/heavy to conform to the true wake of the vehicle.
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