Driverless cars still on way -- but slowly

It was seven years ago when Waymo discovered that spring blossoms made its self-driving cars get twitchy on the brakes. New tests, in years of tests, revealed more and more distractions for the driverless cars. The wizards of Silicon Valley said people would be commuting to work in self-driving cars by now. In 2015, the electric carmaker Tesla's billionaire boss, Elon Musk, said fully functional self-driving cars were just two years away. A pedestrian in Arizona was killed in a crash with one of its driverless cars.