The world of autonomous vehicles is entering a new phase. This progress resurfaces a question that has become familiar in recent years: how close are we to widespread proliferation of fully autonomous vehicles? This distinction matters because much of the public debate still focuses on what autonomous vehicles can do. That is why autonomous driving remains such a difficult problem to solve because the real world rarely sticks to the script. The overlooked infrastructure challengeWhen people discuss infrastructure for autonomous vehicles, the conversation often focuses on what sits outside the vehicle.