In what situation might your high-beam assist be unable to dim your vehicle’s high beam in good time when encountering oncoming traffic?

The selected combination is correct because both situations—driving over a summit and driving around a bend—can hinder the high-beam assist's ability to detect oncoming traffic in a timely manner. According to German traffic rules, high-beam assists are designed to enhance visibility without blinding other drivers, but they rely on clear sightlines to function effectively.

When driving over a summit, the vehicle's elevation change can obstruct the sensor's view of approaching vehicles. Similarly, when navigating around a bend, the angle can also make it difficult for the system to identify oncoming traffic early enough to dim the high beams.

The third option, being dazzled by an oncoming vehicle, is not part of the correct answer. This situation concerns the driver's response to the glare rather than the automatic system's capacity to adjust the high beams. Understanding these technical limitations is crucial for safe driving and compliance with traffic regulations in Germany.