Traffic signs, speedlimit wrong positive

Bicycle route signs in the Netherlands are often misinterpreted as speed limit signs.
Osmose uses (the traffic sign) detections to check the OSM for completeness, and generates with these wrong detection, false positives.
An example
Pictures and Dutch description can be found at
These signs have a rectangle shape and having an green encircled number between 1 and 99 on a white background.
While the maxspeed signs in the Netherlands (and many other countries) have black numbers (multiples of 10) on a white background with a red border.
Is it possible to improve the algorithm?

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