Photos from the North Carolina Truck Driving Championships in Raleigh, N.C., May 9-11, 2019. (North Carolina Trucking Association)

Photos from the Georgia Truck Driving Championships in Buford, Ga., May 10-11, 2019. (Georgia Motor Trucking Association)

Photos from the Oklahoma Truck Driving Championships in Oklahoma City, Okla., May 10-11, 2019.

Photos from the Tennessee Truck Driving Championships in Antioch, Tenn., April 26-27, 2019. (Tennessee Trucking Association)

Photos from the South Carolina Truck Driving Championships in Columbia, S.C., May 3-4, 2019.

Photos from the Mississippi Truck Driving Championships in Gulfport, Miss., April 26-27. (Mississippi Trucking Association)

Photos from the Arizona Truck Driving Championships in Tempe, Ariz., April 13, 2019.

Nikola Motor Company showcased five zero-emission products at its Nikola World event in Scottsdale, Ariz., April 16, 2019, including its hydrogen fuel cell Class 8 Nikola Two for long-range driving.

Photos from the Louisiana Truck Driving Championships in Baton Rouge, La., March 29-30, 2019. (John Ballance for Louisiana Motor Transport Association)

Photos from the 2019 Mid-America Trucking Show at the Kentucky Exposition Center in Louisville, Ky., March 28-30, 2019.