Trucking Glossary

Learn what a fifth wheel is, how it works, why it’s important, and how every CDL driver uses it to safely connect a tractor and trailer.

Learn what glad hands are, how they work, why they matter, how to connect them properly, and common mistakes every CDL driver should avoid.

Learn what bobtail means in trucking, why truck drivers bobtail, why it’s more dangerous, and how it differs from deadheading.

Learn what a tandem axle is, how it works on semi trucks and trailers, why it matters, and how it affects weight distribution, safety, and DOT compliance.

Learn what a drive axle is on a semi truck, how it works, why it’s important, and how it affects traction, hauling, and commercial driving.

Learn what a tractor is in trucking, how it differs from a truck, why it’s called a tractor, and how it works with a semi trailer.

Learn what a reefer trailer is, how it works, what it hauls, and why refrigerated freight is one of the most specialized areas of trucking.

Learn what a PTO is in trucking, how a power take-off works, what trucks use it, and why it’s essential for dump trucks and other commercial equipment.

Learn what a differential is on a semi truck, how it works, why it’s important, and how it helps commercial trucks turn safely and efficiently.

Learn what a steer axle is on a semi truck, how it works, why it’s important, and what CDL drivers should inspect before every trip.

Learn what a blindside back is, why it’s more difficult than a sight-side back, and how truck drivers safely perform this important backing maneuver.

Learn what a sight-side back is, why truck drivers prefer it, and how it compares to a blindside back when backing a semi truck safely.