The utopian vision of self-driving cars quietly humming along our roads is nothing new, but much of the work tends to focus on testing a system’s ability to drive a car along a freeway, rather than more tricky busy city streets. However, Google has just published a blog post describing the work it has been doing on this very problem_since August 2012. The company says that compared to the more open freeways, city roads have “hundreds of different objects moving according to different rules of the road in a small area” and as such pose a far greater challenge for...

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