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Men Harassed A Woman In A Driverless Waymo, Trapping Her In Traffic
(www.404media.co)
This is a most excellent place for technology news and articles.
Honestly a proper panic button would have an alarm go off and speed dial 911. But I'm sure people would abuse it.
She talked to an operator who asked if he should call the police and she said no. It's in the article.
Not sure what a button would have changed...