The sign "Demand redirect notification left" is not a standard traffic sign in Germany. However, if you meant a specific traffic sign related to directional changes or rerouting, I can clarify that for you.

In general, signs that indicate a diversion or redirect the traffic will inform drivers of alternative routes due to road closures, construction, or other obstructions ahead. These signs typically alert drivers to prepare for a change in their usual route and often include arrows showing the new direction to follow.

If you have a specific sign in mind or an image you'd like me to analyze, please share it, and I'll provide a detailed explanation.