Progress and disaster are two sides of the same coin. Accident is inseparable from the speed. Virtual speed of unexpected and catastrophic events should be studied instead of the actual speed of objects. As we try to protect ourselves from excess in real speed by means of breaks and automated safety systems, we have to try to protect ourselves from excess in virtual speed, from what unexpectedly happens to substance – meaning to what lies beneath engineer´s awareness as producer. In Aristotle´s Physics, it is indeed the passage of time, in other words the speed which destroys and achieves the ruin of all things, and every substance becomes a victim of the accident in the traffic circulation of time.