It's all worth subcategorizing. Highway driving is substantially safer than surface streets, and if you stick to awake, sober, daytime drivers in good weather,

It's all worth subcategorizing. Highway driving is substantially safer than surface streets, and if you stick to awake, sober, daytime drivers in good weather, the safety of human drivers is even higher. Given that autopilot can handle nighttime, but not the others, it's completely possible that 1/300 million miles is above the sober good weather highway human driver fatality rate.