CDL DOUBLES TRIPLES ENDORSEMENT
FINAL REVIEW MANUAL 2026 TESTED
QUESTIONS CORRECT ANSWERS
● You are driving a 100 foot twin trailer combination at 50 mph. The
road is dry and the visibility is good. You should keep at least ____
seconds of space ahead of you. Answer: 11
● With the hand valve on, you should test the trailer brakes by opening
the service line valve at the rear of the rig. When you do this, you should
hear: Answer: Air escape from the open valve
● You are driving with double trailers and must use your brakes to avoid
a crash. For emergency braking you should: Answer: Use controlled or
stab braking
● Converter dollies: Answer: Often do not have spring brakes
● The crack the whip effect that troubles trucks with trailers. Which is
most likely to tip over: Answer: The rear trailer of a triple
● You are doing a walk around inspection of a double or triple trailer
rig. You should be sure the converter dolly air tank drain valves are ____
and the pintle hook is ____. Answer: Closed, latched
, ● When does the "driver's manual" advise disconnecting the steering
axle brakes to help keep the rig straight? Answer: Never
● If a converter dolly is still under the second trailer and you unlock the
pintle hook, what will probably happen? Answer: The dolly tow bar may
fly up
● You are visually checking the coupling of a converter dolly to the rear
trailer. How much space should be between the upper and lower fifth
wheel? Answer: None
● Which of these statements about quick steering movements and
doubles / triples is true? Answer: Doubles / triples flip over from quick
steering moves more easily than many other vehicles
● Empty trucks may have poor traction due to ______ and wheel
_______. Answer: 1. bouncing
2. lockup
● You are driving a 100 foot truck with double trailers at 30 mph. The
road is dry. Visibility is good. You should keep at least ____ seconds of
space ahead of you: Answer: 10
FINAL REVIEW MANUAL 2026 TESTED
QUESTIONS CORRECT ANSWERS
● You are driving a 100 foot twin trailer combination at 50 mph. The
road is dry and the visibility is good. You should keep at least ____
seconds of space ahead of you. Answer: 11
● With the hand valve on, you should test the trailer brakes by opening
the service line valve at the rear of the rig. When you do this, you should
hear: Answer: Air escape from the open valve
● You are driving with double trailers and must use your brakes to avoid
a crash. For emergency braking you should: Answer: Use controlled or
stab braking
● Converter dollies: Answer: Often do not have spring brakes
● The crack the whip effect that troubles trucks with trailers. Which is
most likely to tip over: Answer: The rear trailer of a triple
● You are doing a walk around inspection of a double or triple trailer
rig. You should be sure the converter dolly air tank drain valves are ____
and the pintle hook is ____. Answer: Closed, latched
, ● When does the "driver's manual" advise disconnecting the steering
axle brakes to help keep the rig straight? Answer: Never
● If a converter dolly is still under the second trailer and you unlock the
pintle hook, what will probably happen? Answer: The dolly tow bar may
fly up
● You are visually checking the coupling of a converter dolly to the rear
trailer. How much space should be between the upper and lower fifth
wheel? Answer: None
● Which of these statements about quick steering movements and
doubles / triples is true? Answer: Doubles / triples flip over from quick
steering moves more easily than many other vehicles
● Empty trucks may have poor traction due to ______ and wheel
_______. Answer: 1. bouncing
2. lockup
● You are driving a 100 foot truck with double trailers at 30 mph. The
road is dry. Visibility is good. You should keep at least ____ seconds of
space ahead of you: Answer: 10
