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Waymo to double down on winter testing its robotaxis | TechCrunch
(techcrunch.com)
This is a most excellent place for technology news and articles.
They testing the driving ability not the cars themselves.
New countries would require them to go all through the regulation approval and teaching the car to drive in different countries with different rules. The USA is massive and diverse. Might as well start there.
And Michigan and Upstate New York can get pretty gnarly in the winter, and they're quite populated areas as well. They're taxis, so it makes sense for them to test in higher population density areas.