The sign "Do not drive on the shoulder anymore" indicates that vehicles are not permitted to use the shoulder of the road for driving. This is typically used to inform drivers that they should return to the main lane of traffic and refrain from driving on the shoulder area, which is reserved for emergencies, breakdowns, or stopping only when necessary.
In Germany, driving on the shoulder is generally prohibited unless you are in an emergency situation or following specific instructions from law enforcement. Shoulders are not designed for regular driving; using them can pose risks to other road users and may result in penalties.
If you have any further questions about this sign or any other traffic rules, feel free to ask!