In what situation does a driver frequently underestimate their own speed?

The selected combination of answers is correct because both situations you chose can lead to a driver underestimating their speed.

On wide, well-finished roads, the absence of visual cues can make speed feel slower than it actually is, leading to a false sense of control. Similarly, after a long journey at high speed, drivers may become desensitized to their speed, making it difficult to accurately assess how fast they are going.

Both scenarios align with the concept of speed perception, which is emphasized in German traffic regulations to promote safety on the road. Drivers are encouraged to remain vigilant and regularly check their speed, especially in these situations, to prevent accidents and ensure compliance with speed limits.