Being able to sense the design speed of a road is completely unrelated to someone&#x27;s estimation of their driving skills.<p>The design speed of a road is, in fact, something you&#x27;re probably only partly consciously aware of as you&#x27;re driving on it; it&#x27;s something you get not from a speed-limit sign but from cues like the way curves are built, the length of merging ramps and exit lanes, or how far ahead of something a warning sign is posted. Whether you think you&#x27;re an above-average driver has nothing whatsoever to do with the fact that you will, consciously or not, learn to pick up on those cues and you <i>will</i> adjust your driving to it unless you&#x27;re constantly watching your speedometer (and even if you do, if you drive significantly below the design speed, there will be times when you&#x27;re uncomfortable doing so, though you might not realize <i>why</i> it&#x27;s making you uncomfortable).