By Paul Ingrassia MOUNTAIN VIEW Calif. (Reuters) – The car stopped at stop signs. Its actually high praise for the car in question: Google Inc.s driverless car. Most automotive test drives (of which Ive done dozens while covering the car industry for nearly 30 years) are altogether different. This test drive, in contrast, took place on the placid streets of Mountain View, the Silicon Valley town that houses Googles headquarters.