The philosopher Adrian Cussins writes about two different ways of knowing about speed.16 He relates the experience of riding his motorcycle around London, adjusting his speed in response to various weather and traffic conditions, and contrasts this with the way one knows one’s speed when one reads it off a dial or digital readout. In that case, speed is rendered as a number, and to learn the significance of this number one has to compare it with another number: the posted speed limit.
