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But especially in the US, dangerous behavior from cyclists seems to be proportionally much more common than dangerous behavior by Waymos. So yeah, it's easy to believe that a cyclist just kind of blew the stop sign when they shouldn't have.
I'm not trying to take any position to this notion. I don't know the facts. I only know that not coming to a complete stop (different from blowing throw an intersection!) does not equate to dangerous behavior. You'll find another link that shows evidence otherwise. "Stop-as-yield" laws would be worth looking into if you're interested.
However, I'm also aware that a lot of cyclists don't 'yield' so much as 'continue at full speed through the 4-way stop sign'.
So far, Waymo seems to have a culture of playing things very by the book and safely, or at least as safe as possible given the constraints of developing self-driving cars on public roads. I think it's very unlikely they'd lie, knowing that they'll have to hand over footage of the incident over to the authorities, and especially given what recently happened with Cruise semi-lying and being absolutely thrashed in the press because of it.