Autonomous cars are not going to be fully ready for quite a while. People greatly overestimate the capabilities of machine learning in general, and especially ANNs, because we want to see them as intelligent. People haven't even really started discussing the dangers of fucking with autonomous cars to try to get them to crash.
For example, some researchers were able to deceive an ANN based street sign classifier easily by placing very small dots on street signs, almost unnoticeable to humans. Here teenagers fuck up speed limit signs with spray paint all the time
See here: (archive of cornell library) for the abstract on the paper, and pic related for sign alterationshttps://arxiv.org/abs/1802.06430