What voice file are you using? Attach it and I'll take a look. Mine, in English, seems to work as expected for the overspeed warning (always says the speed limit).
EDIT: In thinking more about this, the alert that you are getting is sort of typical of the default alert in just about every voice file..in info.ini, --at least this part is: You are over the speed limit:not dictionary.voice. The more specific alert with the speed limit, comes from dictionary.voice (which always over-rides info.ini). So it is possible that your dictionary.voice file does not have the proper phrases at all, or something is causing a conflict. If you post your file, I can take a look at it, or try one of the (English?, other language?) voice files I have already posted previously to see if that works.
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