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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Louisiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The LA CDL doubles triples test covers the following sections of the Louisiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this LA CDL practice test now to prepare for the actual test!
1. If you will be transporting hazardous materials that require placards, you must:
obtain a hazardous materials endorsement.
transport the materials at night only.
obtain a special transit permit.
ask permission of the local transportation agency.
2. When coupling double trailers, you can secure the second trailer by:
chocking the wheels.
setting the trailer emergency brakes.
using the trailer spring brakes.
All of the above.
3. Alcohol:
does not affect judgement.
impairs depth perception.
improves reaction time.
improves muscle coordination.
4. Driving in very hot weather:
can decrease oil pressure.
should never be done.
can increase tire pressure.
can make it difficult to stay in your lane.
5. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
for one day
several times
for 3 days
for one stop
6. Radial and bias-ply tires:
should be used together only when driving in packed snow.
should not be used together.
should be used together.
should be used together only during bad weather.
7. Doubles:
are easier to drive than straight trucks.
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
None of the above.
8. How should you apply the brakes when going down a steep downgrade?
Apply the brakes when you reach the bottom of the downgrade.
You should not brake, and only use engine braking to prevent brake failure.
Apply the brakes as hard as you can without locking the wheels.
Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
9. Do NOT use the parking brakes:
when you leave your vehicle.
if the brakes are very hot.
to test that they work.
when you park for less than two hours.
10. For a cargo fire in a box trailer, you should:
open the doors immediately and use the fire extinguisher.
wait 10 minutes before opening the doors.
keep the doors shut.
use the fire extinguisher on the doors.
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LA Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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