The annual 72-hour safety-inspection blitz known as Roadcheck is under way.
Between midnight Monday and midnight Thursday, roadside inspectors are expected to pull over 60,000 or more commercial vehicles in the U.S., Canada and Mexico.
Some vehicles will be pulled over because of obvious defects, according to officials with the Commercial Vehicle Safety Alliance, others will be chosen at random. All trucks that are checked will get a Level I inspection.
This year inspectors are focusing extra attention on seat belt use and cargo securement.