The sign you're referring to is known as the "Boundary marking for stopping or parking bans."

This sign indicates the beginning of an area where stopping or parking a vehicle is prohibited. It serves to inform drivers that they are entering a zone where they must comply with these restrictions. Typically, this sign will be accompanied by additional information on the specific conditions or times when the ban is enforced.

Understanding this sign is crucial for avoiding fines and ensuring safe traffic flow. Always pay attention to additional signage in the area for specifics about when and where the restrictions apply. If you have further questions about parking rules or related topics, feel free to ask!