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LONGMONT, Colo. — National Guard troops used specialized vehicles with tank-like treads to rescue stranded drivers in Colorado in the wake of a massive late-winter storm that unleashed heavy rain and snow on parts of the Midwest early March 14.

Despite growing concerns in the trucking industry over a rise in the legal use of marijuana, there is a general lack of research on the relationship between use of the drug and crashes, as well as a need for better law-enforcement tools and training to detect impaired-driver use of the drug, according to new research by the American Transportation Research Institute.

Fiat Chrysler Automobiles NV recalled almost 863,000 vehicles that violate U.S. emissions standards, another knock for the company after it agreed to make amends for building different trucks and SUVs that polluted more than legally allowed.

WASHINGTON — Training materials on the subject of human trafficking are most effective when tailored to specific industry sectors, said Kendis Paris, executive director of Truckers Against Trafficking.

Executives from BNSF Railway Co. and Amtrak assured federal lawmakers of their firms’ adherence to congressionally mandated requirements regarding automatic braking technology.

A California trucking company has pleaded guilty to illegally transporting more than 128,000 pounds of lead-contaminated plastic battery chips, a hazardous material known to cause irreversible damage to the health of young children who ingest or inhale the substance in contaminated soil or dust.

Companion bipartisan bills have been reintroduced in the U.S. Senate and House that call for a new regulation that would require trucks weighing more than 10,000 pounds to install side underride guards and ensure that rear guards meet an upgraded specified performance standard.

Kentucky Transportation Cabinet officials have begun their yearly process of treating noxious weeds that spring up alongside roads.

Pilot Flying J announced the launch of its new virtual maintenance system, Fleet Center.

Navistar International Corp. said it has signed a service partnership agreement with Love’s Travel Stops that would add more than 1,000 technicians to Navistar’s service network.