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.

Look back at photos from American Trucking Associations' 2019 Technology & Maintenance Council annual meeting at the Georgia World Congress Center in Atlanta, March 17-21.

These are TT's Top 10 most popular cartoons of 2018, ranked by the number of views on our website. The cartoons by Philip "Shade" Kightlinger are one of the most popular features all year on TTNews.com.

Photos from Wreaths Across America at Arlington National Cemetery in Virginia on Dec. 15.