Before the federal government’s revised hours-of-service rules went into effect Sept. 29, suppliers of electronic logging devices were busy updating their software to reflect those changes to the regulation...

The CDL Drug & Alcohol Clearinghouse, which faced frequent crashes and lingering technical hang-ups in its initial rollout earlier this year.

Technical issues that have been causing problems with the transfer of data from electronic logging devices to equipment used by roadside inspectors to check drivers’ hours-of-service records are the...