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WASHINGTON — As autonomous vehicle testing advances without cohesive federal guidelines, companies are operating under inconsistent or nonexistent rules for how and whether a vehicle is monitored and controlled on the road.

Nikola Corp., the troubled hydrogen-powered and battery-electric truck startup, lost a key member of its executive team with the departure of the former head of its fuel cell development program.

Argo AI, the self-driving startup backed by Ford Motor Co. and Volkswagen AG, is considering going public as soon as this year, according to people familiar with its plans.

John Krafcik stepped down as chief executive officer of Alphabet Inc.’s Waymo self-driving vehicle division, and will stay on as an adviser to the business, the company said in a memo.

Electric vehicle stocks, which were hit hard this year as investors shifted out of growth industries, are getting a boost as President Joe Biden mounts a major push to accelerate the adoption of battery-powered cars, and Chinese peers report strong March sales.

Autonomous delivery services — and the challenges they present — are included as a consideration in the Connecticut Department of Transportation’s recently released strategic plan for connected and automated vehicles.

Autonomous technology company Embark announced a new self-driving system whose components and flexible interfaces are intended to be OEM-agnostic and accelerate fleet deployments.

Volvo Group will partner with Aurora Innovation Inc. to develop and commercialize autonomous Class 8 trucks in North America.

Electric vehicle maker Rivian Automotive is borrowing a page from Tesla Inc. and building an exclusive, fast-charger network for its coming R1T pickup and R1S SUV.