There are some signs that driverless cars are hitting some speed bumps. Equity researches at Citi are throwing some cold water on their prognosis, and earlier this month automobile insurers predicted autonomous vehicles might soon “upend” their business models (how do you evaluate risk when the age and record of the driver isn’t relevant?). For all the skepticism, though, the D20 index of autonomous vehicle stocks has performed almost in lockstep with the Dow Jones Industrial Average. With the presence of autonomous vehicles in the next lane still years away, only time will tell when Wall Street will climb aboard.