Uber knows it has a captive audience during rides, and is trying to pick out the coders among them with a new app feature called "Code on the Road." It pops up in the main app and offers "hacker challenges" that are basically 60-second timed coding and debugging tests. Some riders offered the quizzes (like Twitter user Graham Gnall, below) actually work as engineers, but Uber assures Business Insider that it's not tapping any personal info. Rather, it's rolling out the feature in cities with large numbers of tech workers, so you might see it in places like Boston, Seattle and Portland.