Commercial motor vehicle inspectors have quietly gathered data on truck driver personal conveyance time and are making plans to soon ask regulators to limit the use of conveyance time to two hours.

Collecting data during more than 41,000 roadside inspections, leaders at the Commercial Vehicle Safety Alliance say they are convinced that improper driver use of personal conveyance time is on the rise, and that federal crash data shows that companies that employ drivers who improperly use conveyance are four times more likely to get in an accident — and have higher out-of-service rates.

The inspections, which included interviews with drivers whose electronic logging devices recorded conveyance time, revealed that 38% of drivers used the conveyance time improperly.