It’s not more dangerous. It’s clearly limited: your driveway or a roundabout isn’t dangerous, but you don’t speed because it’s not super wide and you don’t expect it to be completely clear of people or things you don’t want to hit.

Most traffic calming measures are similar: break up long sight lines, narrow the lanes, and tighten the corners so people look at the road and think “I’m driving past homes where pedestrians are” rather than “freeway, time to see if I can avoid dropping under the speed limit the whole way!”