Driverless cars are growing in number, but makers don't want to reveal how they sometimes fail
On March 18, a robot-driven Volvo operated by Uber hit and killed a pedestrian in Arizona.
Advocates for automation maintained that the tragedy shouldn't detract from the likelihood that driverless technology is eliminating human error and making driving safer. But the death, and a fatality five days later that involved Tesla's Autopilot driver-assist system, were unusual in another way: They were rare instances in which driverless-car companies were forced to share data about how their systems work, in this case with investigators.
A schism is developing in the driverless-car world - but not between fans and foes of robot cars.
Instead, on one side are driverless-car advocates who believe data transparency will lead to safer deployment of driverless vehicles and help alleviate public fears about the strange and disruptive new technology. On the other
