What must you anticipate with this road sign?

Your answer is completely correct. This triangular road sign with a red border indicates a sharp right-hand bend ahead. According to German traffic rules, you must anticipate the following:

1. You are approaching a hard right-hand bend that requires you to reduce speed and carefully steer.
2. Oncoming traffic might cut the corner due to the sharpness of the bend, so extra caution is necessary.
3. Vehicles in front of you may slow down sharply to safely navigate the bend, so you should maintain a safe following distance.

Understanding this sign helps you drive more safely by preparing to slow down, watch for oncoming vehicles, and be ready for sudden braking by other drivers.