Arkansas Doubles/Triples CDL Practice Test

This is a free 20-question practice test for the Doubles/Triples portion of the Arkansas Commercial Driver's License knowledge exam. Questions are pulled from a pool of 50 drawn from the AAMVA CDL Manual, which is the source document the Arkansas Office of Driver Services uses to write its actual exam.

How it works: Click an answer. The correct choice highlights in green, and you'll see a short explanation. Aim for 85% or better before you sit for the real test in Arkansas.

Question 1 of 20

The "T" endorsement is required to:

Drive any commercial vehicle
Pull two or more trailers
Drive a bus
Haul hazmat

Correct. The T endorsement is required to pull more than one trailer (doubles or triples).

Question 2 of 20

When backing a doubles or triples combination:

Avoid it whenever possible — multi-trailer rigs cannot be backed any meaningful distance safely
Back at full speed
Back without a helper
Use only the trailer brake

Correct. Doubles and triples cannot be backed safely beyond a few feet — joints flex unpredictably. Plan your route and parking to avoid backing.

Question 3 of 20

Drivers should always couple the heaviest trailer:

Behind the tractor (in the front position)
At the rear
In the middle
It does not matter

Correct. Heaviest trailer goes directly behind the tractor; lightest goes at the rear. This minimizes rearward amplification and rollover risk.

Question 4 of 20

A converter dolly is:

A small hand truck
A set of axles with a fifth wheel that converts a semi-trailer into a full trailer for use in doubles/triples
A trailer-loading device
A type of brake

Correct. A converter dolly has a small frame, axle(s), and a fifth wheel mounted on top — it transforms a semi-trailer into a full trailer behind another trailer.

Question 5 of 20

When pulling triples, you should:

Make abrupt lane changes
Drive in the right lane and avoid abrupt steering
Drive in the left lane
Drive at top speed

Correct. Stay right, plan lane changes well in advance, signal early, and avoid abrupt steering. Triples crack-the-whip violently.

Question 6 of 20

Triples are restricted in many states. You should:

Drive triples anywhere
Verify state-by-state legality before crossing into a state
Use a special placard
Avoid driving in cities

Correct. Many states restrict triples to specific routes (turnpikes, designated corridors). Verify legality and route before crossing into a state.

Question 7 of 20

When inspecting a doubles rig, the lights on the rear of the rear-most trailer must:

Be visible, working, and not blocked by the lead trailer
Only the lead trailer's lights matter
Be off
Not be checked

Correct. Brake, turn, and marker lights at the rear of the rearmost trailer must be working and visible — that is what following traffic sees.

Question 8 of 20

A pintle hook is:

The hitch on the rear of a trailer used to tow another trailer or dolly
The kingpin
The fifth wheel
A type of placard

Correct. The pintle hook is the strong rear-mounted hitch that grips the dolly's lunette eye, allowing one trailer to tow another behind it.

Question 9 of 20

Crosswinds are particularly hazardous for:

Empty doubles and triples
Loaded singles
Backing
Slow speeds

Correct. Empty trailers in a multi-trailer rig present a large flat surface to crosswinds — a strong gust can blow the rear trailer over.

Question 10 of 20

When pulling a single trailer and trying to figure out if you should add a doubles endorsement:

You only need T if you actually pull more than one trailer
T is required for any commercial driving
T is required only for tankers
T is required for any class A driver

Correct. The T endorsement is required only when you actually operate doubles or triples. Single-trailer operations do not require it.

Question 11 of 20

A "drive-axle skid" on a doubles rig:

Can lead to a tractor jackknife and complicated trailer movement behind it
Is harmless
Means the dolly broke
Increases stability

Correct. A drive-axle skid leads to tractor jackknife. With trailers behind, the situation gets worse fast — the rear trailers can swing wildly.

Question 12 of 20

When pulling a heavy lead trailer and a light second trailer, the rig:

Will be more stable than the reverse
Is more likely to roll the rear trailer
Is illegal
Drives the same as either order

Correct. Heaviest in front, lightest in rear. Heavy at the rear amplifies crack-the-whip and rollover risk.

Question 13 of 20

When you uncouple a converter dolly, you should:

Disconnect air and electrical, secure or remove safety chains, then release the pintle hook
Just yank it off
Drive forward fast
Use only the trailer brake

Correct. Park level, disconnect air and electric, lower trailer landing gear if applicable, remove safety chains, then release the pintle hook to free the dolly.

Question 14 of 20

A "set of doubles" typically refers to:

A tractor pulling two trailers
One tractor with one long trailer
Two tractors and a trailer
Two tractors and two trailers

Correct. A "set of doubles" is one tractor pulling two trailers (typically two pups, each about 28 feet long, in LTL operations).

Question 15 of 20

When pulling doubles in a tunnel:

Stay alert; clearance and turning radius can be tight
Drive faster
Stop in the middle
Honk continuously

Correct. Tunnel clearance can be tight for long doubles — watch overhead and side clearance, and respect any vehicle-class restrictions.

Question 16 of 20

The driver of a doubles rig should:

Make slow, gradual steering and braking inputs
Drive aggressively
Use only the trailer brake
Honk frequently

Correct. Smooth, gradual inputs are critical. Avoid abrupt steering and abrupt braking.

Question 17 of 20

You discover a flat tire on the rear trailer of a triple. You should:

Continue driving
Pull off safely, set warning devices, and have the tire repaired or replaced before continuing
Drive only at night
Drive faster to balance

Correct. A flat tire affects rig stability and brake load. Pull off safely, use warning devices, and address the tire.

Question 18 of 20

When inspecting a converter dolly, the pintle hook must:

Lock fully closed around the lunette eye
Be loose
Be cracked
Be replaced quarterly

Correct. The pintle hook must close fully around the lunette eye, with no excessive wear or cracks. Add safety chains as backup.

Question 19 of 20

On a triple, the air pressure to the rearmost trailer:

Is the same as the lead
Is delayed by line length, so braking response at the rear trailer lags noticeably
Is faster
Does not exist

Correct. Greater line length = greater brake-lag at the rear. Plan braking earlier than you would for a single trailer.

Question 20 of 20

A converter-dolly fifth wheel must be:

Properly lubricated and have correctly functioning locking jaws
Painted
Wide
Empty

Correct. Inspect for proper lubrication, no excessive wear, and confirm the locking jaws operate correctly. The dolly fifth wheel is just as critical as the tractor's.

About the Arkansas Doubles/Triples exam

Most states administer 20 Doubles/Triples questions and require 80% to pass. The exam emphasizes coupling and uncoupling the converter dolly, rearward amplification (the "crack-the-whip" effect), and the unique inspection and handling demands of multi-trailer rigs.

The Arkansas Office of Driver Services follows the federal CDL standards established by FMCSA. To earn the Doubles/Triples credential, you must answer at least 80% of the questions correctly. Many candidates score lower the first time because the test pulls from a large pool — refreshing this page will give you a different mix of questions, drawn from the same authoritative source.

Want more practice? Try the full Doubles/Triples question bank or browse all Arkansas CDL practice tests.