Which document must a Class 1 truck driver carry at all times while operating their vehicle?

A Class 1 truck driver must carry a valid driver's license at all times while operating their vehicle because it is legally required to operate a commercial vehicle. The driver's license serves as proof that the individual has met the necessary training and testing requirements to safely drive such a large and complex vehicle. Without a valid driver's license, the driver is not authorized to operate the truck, which could lead to legal repercussions, fines, and increased risks on the road.

While other documents, such as a manifest of cargo, insurance paperwork, and a maintenance log, are indeed important for other aspects of operating a commercial vehicle, they do not carry the same legal necessity as the driver's license. The driver’s license is the fundamental requirement that confirms the driver has the certification to be on the road, ensuring both their safety and that of others.