The sign you referred to is known as the Note emblem 1010-59. This sign indicates that there is a mobile speed camera in the area. It is meant to alert drivers to the presence of speed monitoring, encouraging them to adhere to speed limits to avoid fines and ensure safety on the road.

In Germany, mobile speed cameras are often set up in areas where speeding is a common issue, and this sign is placed to remind drivers to be cautious and drive within the legal speed limits. If you have any further questions about this sign or traffic rules in general, feel free to ask!