In the last few years, self-driving vehicles have become more numerous and more controversial. To their fans, these cars-of-the-future take the human element out of automobile control and are far safer than human-controlled cars. To their critics, self-driving cars...

Loading or unloading luggage at a large airport can be a nerve-wracking task. Cars are traveling at different speeds and are constantly changing lanes or making unexpected stops. People who are on foot must be constantly alert. A recent motor vehicle accident at San...