Autonomous vehicles are coming. Now comes the hard part.

Self-driving cars are increasingly common sights on roads in California, Arizona, and a few other pioneering locales. They’re still something of an anomaly, sure, but it won’t be long before autonomous cars go from being an exception to being the norm.

Just when that happens remains to be seen, but the Governors Highway Safety Association says there’s no time to waste. In a report released Wednesday, the association outlines a long list of questions that must be addressed. Laws that may need to be passed. Law enforcement practices that may need to change. And then there’s all the public education to be done if people are to learn how to share the road with cars that drive themselves.