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The responses to NHTSA's questions so far are redacted entirely, citing "confidential business information."

The security review is being performed by the Idaho National Laboratory, and the research is being funded by a company -- or a group of companies -- in the electric and autonomous vehicle industries.

The next-generation robotaxi, called the Waymo Ojai, is central to the company's push towards mass scale, and eventually, profitability.

The partnership is expanding beyond the initial market of Zagreb, Croatia to four additional European cities.