In the wake of Tesla’s first recorded autopilot crash, automakers are reassessing the risk involved with rushing semi-autonomous driving technology into the hands of distractible drivers. But another aspect of autopilot—its ability to hoover up huge amounts of mapping and “fleet learning” data—is also accelerating the auto industry’s rush to add new sensors to showroom-bound vehicles. The race to turn everyday vehicles into vast, data-collecting repositories is becoming a great technological opportunity for legacy carmakers. But in order to earn the enthusiasm of consumers, automakers and startups must first earn their trust.