[ljm]

Could you do it without all or nothing? Mixing self-driving cars with humans means the intelligence has to understand irrational behaviour and has to respond appropriately (speed up rather than slow down, ignore the potential threat, account for traffic behind you), which is sometimes counter-intuitive. And it comes in many ways.

Will a self-driving car know that you don’t pump the brakes when sliding on snow? What about hydroplaning?

If that didn’t exist we wouldn’t have car fatalities or accidents.

[gvkv]

I don't think any of those examples are edge cases. The first set are normal traffic conditions that in the context of self-driving cars are easy to solve, especially in narrowed conditions such as on a highway. Moreover, mid-range cars already have collision warning and automatic braking systems. As to your example of traction issues, pretty much every modern car that I'm aware of has had computer assisted traction control systems for a while now.

The edge cases that are difficult essentially boil down to entity recognition; unexpected and moving obstacles, road sign changes, traffic light outages or alternate signal pathways and the like. Some of those definitely would require government level coordination which is about a lot more than technology.