As a driver, work zones are a headache. For self-driving car's computer, they're the equivalent of a grand mal stroke. A seemingly random and inexplicable disruption of the normal road situations, with every state and locality using their own procedures, signage, and systems for all of their individual road construction projects, human drivers can think on their feet and interpret the symbols and people waving flags well enough to work together to navigate the chaos. Computers, however, writes Aarian Marshall in Wired, basically have a circuit overload when faced with this crazy, illogical situation. Engineers are working on the problem, but if anything slows down your ability to buy a driverless car, it might be this. Read Marshall's full article at Wired.