What do you have to expect after these traffic signs?

You answered correctly. This sign warns of a 10% downhill gradient that stretches over the next 800 meters. In Germany, a red triangle with a downward sloping arrow and percentage indicates a steep descent, and the accompanying sign shows how long it lasts. Drivers should prepare to control their speed and use lower gears to avoid overheating brakes. You do not need to expect an uphill slope, nor is the descent beginning 800 meters ahead—it starts now and continues for 800 meters. Recognizing these signs helps you drive safely and anticipate road conditions.