The Google self-driving-vehicle fleet has grown by one. According to Wired, the tech giant has added a black Lexus RX450h to its autonomous stable. The hybrid SUV was spotted out on the road for testing wearing a new roof-mounted sensor array that's significantly more streamlined than the gear found on the company's autonomous Toyota Prius models. Google says it is constantly testing its driving algorithms on a wide range of vehicles in order to refine the technology, and that the RX450h is merely the latest step in that process.

Google first began unleashing its driverless cars onto public streets in 2010 using a fleet comprised of six Prius hybrids and one Audi TT. The company's work has spurred the California legislature to draft a bill requiring the California Highway Patrol to outline safety standards for autonomous vehicles. Wired reports the legislation passed the state's Senate Transportation Committee with an 8-0 vote and is now headed to the Senate Rules Committee. Nevada has already passed a similar law.

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