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WASHINGTON — Nationwide policy for autonomous cars and trucks has the potential of facilitating the flow of freight while improving safety, according to a senior executive at UPS Inc. on Feb. 12.

Walmart Inc. is big in almost every way — 4,755 stores, 1.5 million employees and $380 billion in revenue in the United States alone. But one part of the world’s largest retailer remains minuscule. “We have a tiny ad business,” CEO Doug McMillon told investors in October. “It could be bigger.”

Trucking groups prepared their drivers with tips on operations and safety as a polar vortex gripped the Midwest, delivering extremely cold temperatures and harsh wind chills.

The advent of ELDs is influencing how carriers and shippers work together to control costs, deploy capacity, design networks, offer and charge for services, make capital investments, recruit and assign drivers and leverage new technology.

FedEx Corp., looking beyond Amazon.com Inc. for growth in e-commerce, is introducing a new late-night shipping option for retailers who want to speedily send orders directly to online customers.

FedEx Express is acquiring the international express delivery business of Flying Cargo Group, a company based in Israel that has been a service partner with FedEx since 1990, company officials announced Jan. 15.

Ryder System Inc. announced it has expanded its digital truck-sharing platform, Coop by Ryder, to South Florida.

Camera monitor systems designed to replace a truck’s conventional side mirrors are getting favor­able reviews from drivers, according to exec­utives at fleets that are testing the new technology, which also recently received a nod of approval from federal regulators.

United Parcel Service Inc. is expanding a keyless-entry system for package deliveries at apartment buildings after a successful test in New York and San Francisco.

Oaktree Capital Management is investing $450 million and forming a strategic partnership with Watco Cos., a privately owned company that provides a broad range of rail transportation services in North America and Australia.