Google is working on a driverless car that already has spent countless test hours learning the rules of the road. In a new patent awarded today to Google today (March 24), the company outlined a system for external airbags and bumpers that could deploy in the event of an accident. One idea suggested in the patent is to mount airbags on the outside of the cars, to create a buffer for pedestrians. These airbags would deploy when the car senses that a collision with another vehicle is imminent.