cars would inform the Google drivers to reduce and/or increase speed and/or break and/or resume movements <Google voice, sound or written and all others). The sensing of the danger for collision could be done, Google car/s to car/s (Google bus, vans, motorcycles, airplane, helicopters, boats, ships, flying cars, trains, new kinds of trains, mass transit systems and all others) <Google vehicles to vehicles and all others> or through signals from Google traffic light/s (or from radar, satellites, from buildings, houses, structures, posts, roads, walls and all others) on roads (streets, paths and all others) it is running or moving (for any car arrangement or positions among each other on any number and arrangements of roads, paths, water, sea, ocean, air, sky and all others). The above could also be applied for Google cars and pedestrians (or anyone or anything) with cars sensing collision danger through the above or through Google