By Alexei Oreskovic SAN FRANCISCO (Reuters) – Google Inc said it has begun testing its self-driving cars on city streets, a crucial new phase in its quest to eventually make the technology a standard feature in automobiles. After several years of testing self-driving cars on freeways, where driving conditions are more predictable, Google in the past year shifted its focus to city street driving, the company said in a post on its official blog on Monday. Google said it has driven thousands of miles on the streets of Mountain View, California, a small suburban community where the company maintains its headquarters roughly 35 miles South of San Francisco. Googles driverless cars rely on video cameras, radar sensors, lasers and a database of information collected from manually driven cars to help navigation, according to the company.