Because the trailer portion of a tractor-trailer sits so high off the ground, trailers are particularly hazardous for passenger vehicles, which can easily slide under the trailer in a crash.

According to those who oppose the proposed speed limit increase in North Dakota, even a five-mph hike will result in more traffic accidents.

The opioid abuse epidemic in the United States has become a widespread problem in nearly every part of the country. According to the Centers for Disease Control and Prevention (CDC), six out of 10 drug-related deaths in the U.S. involve an opioid, and the number of opioid-related fatalities has quadrupled since 1999.

Once it goes into effect, the new truck driver training rule will require specific classroom instruction for beginner truck drivers, as well as on-the-road training. However, safety advocates have been critical of the rule, which does not require any specific amount of time for new commercial drivers to spend behind the wheel before hitting the road as a professional.

The comprehensive study examined data from 20 different trucking fleets,15,000 accidents, and 138,000 tractor-trailers.