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the four diacritics representing the tones are identical to Zhuyin's." Don't you mean Hanyu Pinyin's? I.e., I see the first tone marked in your example.
Actually MPSII is used, in many Taibei County white vertical street signs.
P.S., note some key people behind MPSII, like 王天昌 of 東海大學。 --jidanni
