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Reefers need to be able to keep freight at a specified temperature, but there is more than one way to achieve thermal efficiency.

Many in the industry say variable-speed drives, which run only as fast as necessary, are increasingly popular. Variable drives can save on horsepower and therefore save on fuel. However, the more traditional on-off drive also is a popular choice because it’s simplest and cheapest.

Not all fleets are convinced of the benefits of air disc brakes. But suppliers maintain there is a growing acceptance of them for heavy-duty trucks, driven by an increase in the deployment of active safety technology, such as collision mitigation and avoidance systems.

In the endless quest to make trailers lighter, sturdier and more thermally efficient, some trailer manufacturers are expanding their use of composite materials, which could offer the potential for a higher strength-to-weight ratio.

When Cummins Inc. invited industry journalists to the introduction of its X15, the new generation of its 15-liter truck engine, the event showcased not only the latest in heavy-duty truck engines, but also the evolution of transmission technology in trucking.

At Memphis International Airport, drones may soon be inspecting planes and delivering airplane parts for FedEx Corp. In Reno, Nev., they will test airlifting life-saving defibrillators to patients. And customers in Virginia could be awaiting Alphabet Inc.’s flying devices to get goods they ordered.

UPS Inc. plans to deploy a small fleet of futuristic, boxy-looking all-electric delivery trucks as part of a pilot program in London and Paris by the end of this year.

Uber believes its self-driving software that chooses how to react when it detects objects in the roadway is the cause behind a fatal collision between one of its vehicles and a pedestrian.

LONG BEACH, Calif. — Roush CleanTech unveiled its all-electric technology in a Ford F-650, marking an expansion of its alternative-fuel market beyond propane autogas and compressed natural gas.