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One of the more puzzling questions arising from the revolution in autonomous vehicles and on-demand services is what impact it will all have on cities.

Houston will join 21 other cities in a national partnership aimed at addressing persistent transportation challenges as technology and mobility choices have planners rethinking how streets, sidewalks and private spaces interact.

The fatal crash involving an Uber self-driving car in Arizona last month has not dissuaded the North Carolina Turnpike Authority from urging companies to test autonomous vehicles on the Triangle Expressway in western Wake County.

When a woman crossing an Arizona street was struck and killed by a self-driving Uber car late last month, it sparked a swift public reckoning over the near-term future of autonomous vehicle testing on public roads.

California began accepting applications April 2 for permits to deploy self-driving cars on public roads without a human backup driver at the wheel.

U.S. lawmakers have applied a light touch in regulating robot cars. At the national level, the Trump administration has proclaimed that driverless-car guidelines should be “entirely voluntary” for automakers, and bills pending in Congress would clear the way to putting tens of thousands of autonomous cars on the road — orders of magnitude more than the few hundred in the country today — before federal safety regulations are set.

The only engineering facility built expressly to test self-driving vehicles will officially open April 4 at the historic 335-acre Willow Run site just west of Detroit.

Jarrett Cos. has purchased a 53-acre property in Seville, Ohio, that it expects eventually will be used by driverless, autonomous trucks.

Uber Technologies Inc. has found itself isolated a little more than a week after one of its self-driving SUVs hit and killed a pedestrian in Arizona.

Lior Ron, a central figure in Uber Technologies Inc.’s self-driving-truck project, left the company, said people familiar with the matter.