Intended for surveillance, Urbie is a low-profile, remotely operated machine that crawls over obstacles on bulldozer-like tracks, beaming images of what it sees to its operators. The robot is intended to be exceptionally durable, capable of flipping over and surviving shocks that would destroy most other robots. In a simulated rapid-deployment mission from the comfort of a car, iRobot researcher Tom Frost guides Urbie up a flight of steps in Somerville, MA. From the book Robo sapiens: Evolution of a New Species, page 147.