If a car is traveling at 30mph with a tail wind of 30mph and you stick your head out the sun roof what will happen? (not a trick question, i don't know)
Theoreticaly you would feel no wind, however the chances of being able to prove this are almost impossible as you would find it very difficult to find a wind of exactly 30mph in exactly the right direction etc. There is also the problem of the dispacement of air by the travelling car creating a higher pressure above the car and therfore an increase in wind speed........Good luck trying....let us know how the flies taste.