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Uber’s self-driving cars returned July 24 to Pittsburgh’s streets four months after one of its autonomous SUVs hit and killed a woman crossing a street in Tempe, Ariz.

GM Cruise is running neck-and-neck with Waymo, a subsidiary of Google, to be first to bring fully autonomous cars to market. The two companies are considered the leaders in a crowded field, and San Francisco is the proving grounds to refine the technology.

The permitting process will get faster and more convenient next month for Michigan’s Lenawee County Road Commission staff and trucking firms.

As the race to create robot cars intensifies, a secondary race is underway: a high-stakes competition to develop the sensors that serve as the cars’ “eyes.” Lidar, a light-sensing form of radar, provides vision for the vast majority of autonomous vehicles being developed, but now there are dozens of companies with different twists on it.

Uber laid off its team of self-driving car safety drivers in Pittsburgh on July 11, the company confirmed.

WASHINGTON — As Silicon Valley and automakers attempt to steer the nation toward a future of driverless vehicles, a group of influential lawmakers remains concerned that bipartisan legislation now moving through Congress could leave consumers at risk by preventing states from demanding tighter safety regulations.

As self-driving vehicle experiments are launched in a few cities around the United States, Mercedes-Benz maker Daimler AG and a prominent auto supplier are launching a new one in the place that would seem most receptive: Silicon Valley.

Self-driving vehicles have traveled safely for 26,000 kilometers (16,156 miles) in test areas in China’s capital city, according to Beijing Innovation Centre for Mobility Intelligence, a service provider of road tests for autonomous vehicles.

Self-driving shuttle buses will be hauling riders around downtown Columbus later this year, a significant move as the city begins initiatives aimed at making it a “smart city” for transportation.