In 2013, when a state representative put forward a bill to study autonomous vehicles, proponents faced an image problem: “Scary robot cars!” That’s how Rep. Steven Smith, a Republican from Charlestown, described the past image of self-driving cars after discussing his new bill, which would shape how New Hampshire should prepare for autonomous vehicles. Judging from Tuesday’s hearing on the bill before the House of Representatives’ transportation committee, robot cars aren’t scary anymore.