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U.S. transportation regulators plan to take another step toward rewriting federal rules hampering the development and adoption of autonomous technologies — from cars and trucks to buses and trains.

Next year, General Motors Co. will no longer need an engineer in the front seat babysitting the robot brain that controls its self-driving Chevrolet Bolt. The steering wheel and pedals will be gone, giving total control to the machine.

WASHINGTON — Electric-vehicle technology for the medium- and heavy-duty sector is developing rapidly, but the price and range of these vehicles must improve for widespread deployment to take hold, industry experts said.

WASHINGTON — Researchers are joining major retailers, logistics firms, city transportation offices and others in the freight industry to reconsider last-mile delivery systems, even reviewing the way they get packages the “final 50 feet” in congested urban downtowns.

WASHINGTON — Einride, a Swedish technology startup that plans to begin moving cargo in that country later this year with unmanned, all-electric vehicles, recently showcased its vision for freight transportation to industry researchers in the United States.

Federal regulators are taking the first step toward creating a policy to guide the development of autonomous transportation beyond cars to include trucks, buses and other ground-based modes.

WASHINGTON — Innovations in the growth of “big data” are moving traffic research from the reactive to the predictive, a top U.S. Department of Transportation official said.