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CDL Class A · 8 Essential Terms
CDL pre-trip and safety items: the inspection habit, steer-tire tread, cargo securement, warning triangles, the fire extinguisher, hours of service, the coupling check, and lights. Confirm figures against your current manual.
License law is state-specific and manuals are revised. Confirm every item against the candidate handbook for the state where you will test.
Study desk
A systematic look at the vehicle before it moves, covering leaks, tires, lights, coupling, brakes, and emergency equipment, done the same way every time so nothing is skipped.
Flip cards, the timed match, and the quiz open in this panel. The full glossary below is ready either way.
Every term, pronunciation, definition, memory hook, and exam trap is written out here so you can review the whole set or print it.
pree-trip in-SPEK-shun
A systematic look at the vehicle before it moves, covering leaks, tires, lights, coupling, brakes, and emergency equipment, done the same way every time so nothing is skipped.
Mnemonic. Walk it the same way every time. Memory is a poor checklist.
Exam trap. The trap is a familiar truck. Familiarity is not an inspection. The exam wants the defects you would only see if you walked: a leak, a cut tire, a loose glad hand.
tred depth
The remaining depth of the tire's grooves. CDL manuals commonly teach a minimum of 4/32 inch on steer tires and 2/32 inch on other tires, measured in a major groove.
Mnemonic. Steer tires are held to the deeper minimum because they steer and carry the front.
Exam trap. The trap is using the 2/32 figure on a steer tire because that number is familiar from a car. Confirm the fraction in your manual, and do not measure on a wear bar and call it plenty.
KAR-goh sih-KYOOR-munt
Cargo must be immobilized against movement forward, backward, and sideways, and it must not leak, spill, or blow off the vehicle.
Mnemonic. If it can shift, it is not secured. Tiedowns have to survive the trip, not just the yard.
Exam trap. A load that looks tight at the dock and is unchecked after the first miles is the trap. Securement is rechecked because straps loosen and freight settles.
WAR-ning TRY-ang-gulz
Reflective warning devices set out when a commercial vehicle is stopped on the road. The spacing depends on whether the road is two-way, divided, or hidden by a curve or hill.
Mnemonic. Triangles speak to approaching traffic. The pattern changes when the road changes.
Exam trap. One memorized spacing for every scene is the trap. Two-lane roads, divided highways, and hills do not use the same placement. Use the diagram in your manual.
fyr ek-STING-gwish-er
The charged, secured, and reachable extinguisher a commercial vehicle carries. The pre-trip check confirms it is present, rated, and showing a charged gauge.
Mnemonic. Check the gauge and the bracket before you need the extinguisher.
Exam trap. The trap is a missing or discharged bottle that the driver plans to replace at the next terminal. It is an out-of-service kind of defect on the exam, not a later errand.
ow-erz uv SER-vis
The federal and state limits on driving and on-duty time. A long-standing property-carrying framework is 11 hours of driving inside a 14-hour window, with a break rule and a 60/70-hour limit.
Mnemonic. The clock in the manual is the clock that counts, not the load's urgency.
Exam trap. Limits are revised, and passenger, property, and short-haul rules differ. The trap is answering from memory of an old wallet card. Use the manual assigned for your test, and do not drive past the limit because the delivery is close.
KUP-ling chek
After coupling, the driver confirms the jaws are locked on the kingpin, there is no daylight at the fifth wheel, the air and electrical lines are connected and supported, and the landing gear is fully raised. A tug test comes before the final trust.
Mnemonic. Lock, look, tug, raise the gear, and do not skip the look.
Exam trap. The trap is a tug test performed with the trailer brakes released and the tractor brakes released too, which proves nothing, or a tug test with no visual check of the jaws.
LY-ting chek
A pre-trip verification that headlights, markers, turn signals, brake lights, and reflectors work and are clean. Brake lights require someone to look, or a reflection you can actually see.
Mnemonic. If you did not see the lamp light, you have not checked the lamp.
Exam trap. The trap is checking the brakes from the driver's seat with nobody and no reflection behind the trailer. A burned-out brake light is invisible from the cab.