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LAS VEGAS — A marketing video by Navistar Inc. demonstrated the company’s interest in regaining the business of over-the-road fleets by including extended visits with drivers from J.B. Hunt Transport Services, Mesilla Valley Transportation and Cowan Systems — all members of the Transport Topics Top 100 list of the largest for-hire carriers in the United States and Canada.

This week’s annual Management Conference & Exhibition, hosted by American Trucking Associations, is expected to draw a record number of attendees, including industry leaders and some of the most influential federal regulators.

While the idea clearly has strong supporters, not everyone agrees that allowing young drivers behind the wheel of big rigs is either safe or a wise solution to one of trucking’s biggest headaches: the driver shortage.

Commercial truck drivers who get treatment for obstructive sleep apnea for two years may reduce their crash risk to the level of drivers without apnea, a study from Italy suggests.

Fleets that invest in safety technologies — from onboard cameras and telematics to active safety systems — are likely to see their investments pay off by helping to reduce or eliminate catastrophic risks and costly claims, insurance brokers and other experts said.