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The Self-Driving Cars Wearing a Cone of Shame
(slate.com)
This is a most excellent place for technology news and articles.
For the record: the same article has an update (Wednesday June 14 2:10 p.m. EST) where the SFPD state that the car did not block any emergency services.
Then I was wrong. I read it before the update and didn't re-read when I posted (I didn't think there would be a reason to).