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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 Michigan doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MI CDL doubles triples test covers the following sections of the Michigan CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MI CDL practice test now to prepare for the actual test!
1. Air storage tanks:
pump air into the air storage tanks.
hold compressed air for the brakes.
use parts of the service brake systems to stop the vehicle in a brake system failure.
2. What should you do if you doubt you have safe space to pass under a low bridge?
If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
Increase the weight of your vehicle to clearing under the bridge.
Go slowly, and take another route if you are not sure you can make it.
3. If coolant has to be added to a system without a recovery tank, you should:
keep the engine running while adding coolant.
turn the radiator cap quickly to the first stop.
wait until the engine has cooled before adding coolant.
4. When you back under a trailer:
back the tractor slowly.
use lowest reverse gear.
All of the above.
5. Watch out for black ice:
when the temperature is above freezing and the road is dry.
any time the temperature is below freezing and the road looks wet.
when it is snowing.
6. On dry pavement, the braking distance when travelling at 55 mph is about:
419 feet.
142 feet.
216 feet.
7. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
50 psi
75 psi
100 psi
8. When possible, you should park:
so you will have to back up when you leave.
so you will be able to pull forward when you leave.
on the shoulder.
9. When driving a double or triple, you should:
decrease your following distance.
increase your following distance.
drive in the left lane whenever possible.
10. When going down a steep downgrade, you should primarily brake using:
the braking effect of the engine.
the parking brake.
the service brakes.
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MI 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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