Comment by svat

The article has a couple of quotes from Waymo leads on the topic:

> “Freeway driving is one of those things that’s very easy to learn, but very hard to master when we’re talking about full autonomy without a human driver as a backup, and at scale,” Waymo co-CEO Dmitri Dolgov said

and

> While many assume freeway driving is easier, it comes with its own set of challenges, principal software engineer Pierre Kreitmann said in a recent briefing. He noted that critical events happen less often on freeways, which means there are fewer opportunities to expose Waymo’s self-driving system to rare scenarios and prove how the system performs when it really matters.

Both point to freeway driving being easier to do well, but harder to be sure is being done well.