I would normally pick an ISO standard over ANSI simply because it is probably more widely accepted. I came across a paper on the image to be used in a car to signal that tire presure is low.
I have seen the ISO image and it took me a moment to guess what it meant. Even then I looked it up. The interesting thing is that the image is a cross-section of a tire without a rim. I am going to guess that most drivers do not know what that looks like.
The paper is interesting not only because it gives insight into what symbols drivers understand but because it deals with designing an interface to communicate with humans.
http://www-nrd.nhtsa.dot.gov/vrtc/ca/capubs/tpms_hfes01final.pdf
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