Ok, phrased misleadingly, I guess. My thought was more along the line of »How frequently would I need to speed up to avoid something instead of slowing down?« – generally it doesn't seem wise to me to add more energy to a situation and so far I haven't come across a situation where slowing down wasn't an appropriate response (granted, something heavy coming up fast from behind is an issue, but that also only helps if there's nothing in the front to speed into).

Anecdotal as well, also with a huge grain of salt, considering that despite being somewhat old, I'm only allowed to drive since December. To other drivers I'm probably overly cautious, I guess.