Big Tech’s self-driving vehicles — a fleet of white Jaguars and powder-blue Zeekrs topped with rotating black cameras and radar — have been rolling around Denver for two months , ingesting data into their artificial-intelligence computers ahead of public activation next year.

The Waymo expansion here, part of a push into as many as a dozen cities, for which the California-based company secured $5.6 billion from investors, accelerates the spread of machine-learning technology and may help robotaxis overcome a technical problem: navigating thick, sensor-obscuring snow.

But no government agency in Colorado provides independent regulatory oversight, despite hundreds of collisions in other cities . State lawmakers in 2017 gave tech companies the green light to deploy autonomous vehi

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