Washington CDL Practice Test 2026

Not quiteCorrect answer: A — A current medical examiner's certificate, given to his state driver licensing agency and kept up to date

This category is the one the federal physical qualification rules were written for, and the state records the result on the driving record. That is why the certificate goes to the licensing agency rather than staying in the driver's wallet or a carrier's file.

Treating the medical card as a document that only concerns the driver and his employer, so it is never filed with the licensing agency and the driving record shows no certified status.

Not quiteCorrect answer: A — Keep the vehicle out of service until the defect is repaired or certified as not needing repair.

An uncertified safety defect means nobody has confirmed the vehicle is fit to drive. Once you know that, the decision to move it is yours, and so is the outcome when the hose wears through on a downgrade.

Believing that re-reporting a known defect discharges the driver's duty, when writing it down a second time changes nothing about the condition of the hose.

Not quiteCorrect answer: B — Only where a defect was written up and someone has certified it repaired or found not to need repair.

The signature is an acknowledgement of two specific things: that a defect was reported and that the carrier certified how it was resolved. On a report with nothing noted there is nothing for the driver to acknowledge.

Signing every report by reflex, which turns the signature into a meaningless habit instead of a deliberate check that a known defect was actually dealt with.

Not quiteCorrect answer: C — Any condition that touches safety, and any condition heading toward a mechanical failure.

The reporting threshold sits well below the out-of-service line: a condition that merely points toward a future failure is exactly what the report is designed to capture while it is still cheap to fix.

Setting the reporting bar at 'out of service,' so a weeping seal or a slack belt goes unwritten until it becomes the failure it was warning about.

Not quiteCorrect answer: C — Work out what emergency it could develop into and decide now what your way out would be

Spotting hazards is not the goal in itself; it is the raw material for an escape plan. Deciding in advance where you would go and how you would slow means the decision is already made when the seconds get short.

Treating hazard recognition as the finished skill. Drivers who spot everything but plan nothing still arrive at the emergency with no chosen escape and default to a panic reaction.

Not quiteCorrect answer: C — There is only enough air for a few releases, so plan where you are going first

The reserve tank exists to move a vehicle out of danger, not to keep it in service. Each release spends part of a small supply, so a driver who moves without a plan can run out somewhere worse than where they started.

Treating the emergency release as a working air supply, which turns a bad parking spot into a stalled vehicle in traffic.

Not quiteCorrect answer: B — The tractor can shove the standing trailer sideways and fold its landing gear

Coming in crooked means the fifth wheel strikes the trailer plate off to one side and pushes rather than lifts. Landing gear is built to hold weight straight down, not to take a sideways shove, and it folds.

Assuming the trailer will simply slide or swing into line as you back into it. It is standing on legs that break, and the tractor is far stronger than they are.

Not quiteCorrect answer: B — Black ice, which is invisible from the cab because you are looking straight through it at the pavement

Black ice gives you no visual cue of its own; all you get is a surface that reads as wet. Below freezing, that wet look has no innocent explanation, and any road that looks wet in those temperatures should be treated as ice until proven otherwise.

Reading a wet-looking surface as harmless water regardless of temperature. Water and black ice look identical from the cab; the temperature is the only piece of information that tells them apart, and drivers who ignore it discover the difference through the steering wheel.

Not quiteCorrect answer: C — Water and oil collect in them and can damage the system or freeze

Compressing air squeezes moisture and compressor oil out of it, and both end up in the tanks. Left there, the water can freeze in cold weather and block valves, so tanks are drained daily unless the vehicle has automatic drain valves.

Treating compressed air as clean and dry, when compressing it is precisely what pulls water out of it.

Not quiteCorrect answer: A — At the top, before the vehicle starts down

You shift while you still have a choice. Once gravity has the vehicle moving, engine and road speed no longer match the low gear, and the attempt to grab it can leave you in neutral with no engine braking at all, on a grade, with only the service brakes. Selecting the gear at the top means the choice is made while it can still be made.

Thinking the low gear will slot in more easily once there is momentum behind it. The opposite is true, and this is the specific mistake behind runaway trucks: the driver waited, missed the gear, and arrived at the bottom with brakes that had done the entire descent alone.

Not quiteCorrect answer: B — The nuts are loose and have been working against the wheel.

Rust streaking radiating from a fastener is produced by movement: the nut has been shifting and grinding, pumping rusty debris out from under itself. The nuts must be tested for tightness, not merely cleaned.

Reading rust as cosmetic surface corrosion, so the driver wipes away the only visible evidence that a wheel is about to come off.

Not quiteCorrect answer: A — Within 45 seconds

A dual system has to replenish air fast enough to keep up with repeated brake applications. If buildup is slow, pressure can fall away during driving and force an emergency stop, so a vehicle failing this check should not be driven. Larger than minimum tanks can legitimately take longer, per the manufacturer.

Applying the old single-system standard of 50 to 90 psi in three minutes to a modern dual system, which would let a badly weakened compressor pass.

Not quiteCorrect answer: A — A 60-day disqualification, rising to 120 days once the driver reaches three or more convictions within three years

These convictions carry disqualification sanctions on top of civil penalties against the driver, which can reach up to $2,750 per violation. The step from 60 to 120 days is what turns a repeated habit into lost work.

Treating phone convictions as ordinary fines that stay off the CDL. A driver who budgets for the ticket and keeps the habit does not see that the second conviction takes the licence out of service entirely.

Not quiteCorrect answer: B — It buys you time to check your mirrors and either ease off or signal a lane change, so you are not forced into a sudden move if the car swings back across your path

Early recognition converts a future emergency maneuver into a present, unhurried one. Hard braking or a snap lane change in a loaded commercial vehicle is itself a crash risk, so the value of seeing the hazard is that it removes the need for the violent move.

The idea that quick reflexes substitute for early scanning. Reaction speed cannot recover the stopping distance a heavy vehicle needs, and the abrupt response often creates a second crash behind you.

Not quiteCorrect answer: C — The driver, who must spot an overload or a badly distributed load even when other hands did the loading

The rules attach the duty to the person who takes the vehicle onto the road, because that is who will have to control it. Who physically stacked the freight changes nothing about who answers for it.

The belief that having someone else load and sign for the freight transfers the legal responsibility for weight and securement away from the driver.

Not quiteCorrect answer: A — The empty van rides higher than it did loaded, so yesterday's clearance proves nothing

Weight compresses the suspension and tires, so removing the load lets the body rise, and a vehicle that just fit when loaded can strike the same structure when empty.

The belief that a vehicle's height is a fixed specification, when the loaded and unloaded heights of the same van are genuinely different.

Not quiteCorrect answer: A — Blind spots remain however the mirrors are set, so you check often enough to know when a vehicle has gone into one

No mirror arrangement covers every area around a long vehicle. What frequent checking gives you is continuity: you saw the vehicle approach, you know roughly where it must be now, and you know not to move over even though the glass currently shows nothing there.

Reading an empty mirror as an empty lane. A blind spot is defined by not appearing in any mirror, so the absence of a vehicle in the glass is not evidence that the lane is clear.

Not quiteCorrect answer: C — Three red reflective triangles, or six fuses, or three liquid-burning flares.

The requirement is for a complete set of one type of device, not a mixture. Carrying a partial set of two kinds leaves you unable to mark the vehicle properly when you are stopped in a traffic lane.

Mixing up the warning devices that mark a stopped vehicle with the other required emergency items. The fire extinguisher and spare fuses are separate requirements, not substitutes for triangles.

Not quiteCorrect answer: A — Let the clutch begin to take up drive while the brake is still held, keeping the truck held — on the parking brake if needed — until the engine has enough power to move it

Rollback happens in the instant between the brake releasing and the engine taking the load, so the fix is to overlap the two: the clutch is already biting, or the parking brake (or a trailer hand valve, if fitted) is holding, until there is enough power to move forward. Release the holding device only after the engine is pulling.

Believing engine revs and a fast clutch release substitute for a proper overlap. Dumping the clutch on a loaded truck either stalls it or lurches it, and the vehicle still rolls back in the gap before it grabs.

Not quiteCorrect answer: A — Park on level ground, chock the wheels, and let the brakes cool before setting the parking brakes

Clamping very hot brakes can damage them with the trapped heat. Chocks on level ground hold the vehicle mechanically while the drums cool, and the parking brakes go on once the heat has come out of them. Never leave the vehicle held by nothing at all.

Assuming the parking brake is always the right answer for holding a vehicle, without recognizing the two conditions, very hot brakes and very wet brakes in freezing weather, where it causes damage.