flashed into 30-zone – contradiction useful?

Hello, I was flashed on the L333 shortly after the village entrance Herchen-Bahnhof with 54km/h in a 30s zone (was professionally traveling with company vehicle). I really missed the sign and never deliberately drive too fast! Especially on this dangerous, winding, downhill route I paid very careful attention to every speed limitation / local entrance sign. That oversized, for me quite unusual 30s sign because of the there school I have a I didn’t know where to go and came by there for the first time.http://img194.imageshack.us/img194/9799/20120425122133583.jpg I once heard that a maximum of three signs per mast are permissible. There are only 3 signs on the mast, but there are several informations + traffic signs on the big sign. A total of 6. In addition, there is also a warning beacon that steers the view away from the guilt. t more straight (above right the tree is already growing in, but of course no content is covered yet). Do you think that it can be a good choice to file an objection against the criminal complaint? I still have no points and could easily hurt the one point. But the bus money of ~105EUR hurts me very much as a low earner.