CDL- Combination Vehicles (Doubles and Triples) Page 1 2026-03-29
CDL- Combination Vehicles (Doubles and Triples)
Q1: You wish to turn right from a two-lane, two-way street into another. The truck and
trailer combination are too long to turn without swinging wide. Which figures shows how
you should make the turn?
a) picture
b) Answer
c) picture
b) Answer
Q2: The best way to stop any skid is to:
a) Counter steer
b) Restore traction to the tires
c) Use stab or controlled braking
b) Restore traction to the tires
Q3: Which of these statements is true about quick steering movements with a set of
doubles or triples?
a) A set of doubles or triples turn over easily than other vehicles combinations
b) Apply the brakes at the same time as the quick steering movements
c) Counter steering is easier with a set of doubles or triples than with most other
vehicles
a) A set of doubles or triples turn over easily than other vehicles combinations
Q4: Which of these statements is true about managing space on the sides of your
vehicle?
a) Always keep your vehicle to the right side of your lane
b) Avoid traveling next to others when possible
c) Always keep your vehicle to the left side of your lane
b) Avoid traveling next to others when possible
Q5: Before you can supply air to the air tanks of a second trailer you need to:
a) Open the shut-off valves at the rear of both trailers
b) Open the shut-off valves at the rear of the first trailer and close the shut-off valves at
the rear of the second trailer
c) Close the shut-off valves at the rear of the first trailer and open the shut-off valves at
the rear of the second trailer
b) Open the shut-off valves at the rear of the first trailer and close the shut-off valves at
the rear of the second trailer
Q6: During normal operations, the brakes on a set of double or triple trailers are
controlled by the:
a) Hand valve
b) Johnson bar
c) Foot pedal
c) Foot pedal
Q7: For coupled double or triple trailers, all of the converter dolly shut-off valves should
be:
a) Open
b) Closed
c) Open, except the one connected to the rear trailer should be closed
a) Open
CDL- Combination Vehicles (Doubles and Triples) Page 1 CDL- Combination Vehicles (Doubles and Triples).pdf
,CDL- Combination Vehicles (Doubles and Triples) Page 2 2026-03-29
Q8: Check trailer height before connecting a converter dolly to a second or third trailer.
The trailer height is correct when the:
a) Trailer rises slightly when the converter dolly is backed under it
b) Center of the kingpin will line up with the locking jaws
c) Fifth wheel will be touching the trailer
a) Trailer rises slightly when the converter dolly is backed under it
Q9: When testing the coupling of double trailers, the landing gear of the rear trailer
should be:
a) Fully lowered
b) Slightly raised
c) Fully raised
b) Slightly raised
Q10: Which of these statements is true about speed management and braking?
a) A truck's total stopping distance is the distance it takes to stop once the brakes are
applied at any speed
b) You need about four times as much stopping distance at 40 mph as you need at 20
mph
c) Posted speed limits for curves are safe for all trucks in any situation
b) You need about four times as much stopping distance at 40 mph as you need at 20
mph
Q11: You are driving on a slippery road during the day. What does the Commercial
Driving Handbook say about how much space you should keep ahead of your truck?
a) Allow "much more space" than is needed for ideal driving conditions
b) Allow "one vehicle length for every 10,000 lbs. of gross vehicles weight
c) Add "one vehicle length for every 10 mph"
a) Allow "much more space" than is needed for ideal driving conditions
Empty or lightly loaded trucks:
a) Require shorter stopping distance than full ones
b) Are the easiest to stop since there is no shifting cargo
c) May have poor traction due to bouncing and wheel lockup
c) May have poor traction due to bouncing and wheel lockup
00:1200:55
Which of these statements is true?
a) For a set of couple doubles or triples, be sure the pintle hook is in the open position
b) For a set of doubles or triples, the fifth wheel should be all the way towards the
tractor
c) When coupling a set of doubles or triples, be sure the pintle-eye of the dolly is in the
proper place
c) When coupling a set of doubles or triples, be sure the pintle-eye of the dolly is in the
proper place
Which of these statement is true about checking your mirrors?
CDL- Combination Vehicles (Doubles and Triples) Page 2 CDL- Combination Vehicles (Doubles and Triples).pdf
, CDL- Combination Vehicles (Doubles and Triples) Page 3 2026-03-29
a) Correct mirror adjustments can only be checked while driving on a roadway with
traffic
b) Checking your mirrors regularly will eliminate all blind spots
c) Use the mirrors to look for tire fires
c) Use the mirrors to look for tire fires
Which of these statements is true about seeing ahead?
a) At highway speeds you should look 3-5 seconds ahead of you
b) Looking too far ahead causes you to miss things close to you
c) Good-drivers shift their attention back and forth, near and far
c) Good-drivers shift their attention back and forth, near and far
Which of the following is the correct position for shut-off valves for a set of doubles or
triples?
a) Open for the rear of the front trailers and closed for the rear of the last trailer
b) Closed for the rear of both trailers and open for the rear of the last trailer
c) Closed for the rear of both the front and the last trailer
a) Open for the rear of the front trailers and closed for the rear of the last trailer
What is likely to happen if the pintle hook is unlocked with the dolly still under the
second trailer?
a) The air lines will rupture
b) The dolly tow bar may fly up
c) Nothing, unless the rig rolls forward
b) The dolly tow bar may fly up
You are driving a set of doubles when a set of trailer wheels starts to skip. Which of the
following is most likely to occur?
a) The rig will continue moving in a straight line
b) The rig will stay in a straight line but slide sideways
c) The trailer will jackknife
c) The trailer will jackknife
When uncoupling the rear semi trailer, you should lower the converter dolly landing
gear:
a) Until it touches the ground
b) Enough to loft the trailer completely off the dolly
c) Enough to remove some of the weight from the dolly
c) Enough to remove some of the weight from the dolly
Which of these statements is true?
a) You need to look farther ahead when driving a straight truck as compared to a set of
doubles or triples
b) Empty rigs are more likely to turn over in a crash than fully loaded rigs
c) A set of doubles or triples must be driven very smoothly to avoid a rollover or
jackknife
CDL- Combination Vehicles (Doubles and Triples) Page 3 CDL- Combination Vehicles (Doubles and Triples).pdf
CDL- Combination Vehicles (Doubles and Triples)
Q1: You wish to turn right from a two-lane, two-way street into another. The truck and
trailer combination are too long to turn without swinging wide. Which figures shows how
you should make the turn?
a) picture
b) Answer
c) picture
b) Answer
Q2: The best way to stop any skid is to:
a) Counter steer
b) Restore traction to the tires
c) Use stab or controlled braking
b) Restore traction to the tires
Q3: Which of these statements is true about quick steering movements with a set of
doubles or triples?
a) A set of doubles or triples turn over easily than other vehicles combinations
b) Apply the brakes at the same time as the quick steering movements
c) Counter steering is easier with a set of doubles or triples than with most other
vehicles
a) A set of doubles or triples turn over easily than other vehicles combinations
Q4: Which of these statements is true about managing space on the sides of your
vehicle?
a) Always keep your vehicle to the right side of your lane
b) Avoid traveling next to others when possible
c) Always keep your vehicle to the left side of your lane
b) Avoid traveling next to others when possible
Q5: Before you can supply air to the air tanks of a second trailer you need to:
a) Open the shut-off valves at the rear of both trailers
b) Open the shut-off valves at the rear of the first trailer and close the shut-off valves at
the rear of the second trailer
c) Close the shut-off valves at the rear of the first trailer and open the shut-off valves at
the rear of the second trailer
b) Open the shut-off valves at the rear of the first trailer and close the shut-off valves at
the rear of the second trailer
Q6: During normal operations, the brakes on a set of double or triple trailers are
controlled by the:
a) Hand valve
b) Johnson bar
c) Foot pedal
c) Foot pedal
Q7: For coupled double or triple trailers, all of the converter dolly shut-off valves should
be:
a) Open
b) Closed
c) Open, except the one connected to the rear trailer should be closed
a) Open
CDL- Combination Vehicles (Doubles and Triples) Page 1 CDL- Combination Vehicles (Doubles and Triples).pdf
,CDL- Combination Vehicles (Doubles and Triples) Page 2 2026-03-29
Q8: Check trailer height before connecting a converter dolly to a second or third trailer.
The trailer height is correct when the:
a) Trailer rises slightly when the converter dolly is backed under it
b) Center of the kingpin will line up with the locking jaws
c) Fifth wheel will be touching the trailer
a) Trailer rises slightly when the converter dolly is backed under it
Q9: When testing the coupling of double trailers, the landing gear of the rear trailer
should be:
a) Fully lowered
b) Slightly raised
c) Fully raised
b) Slightly raised
Q10: Which of these statements is true about speed management and braking?
a) A truck's total stopping distance is the distance it takes to stop once the brakes are
applied at any speed
b) You need about four times as much stopping distance at 40 mph as you need at 20
mph
c) Posted speed limits for curves are safe for all trucks in any situation
b) You need about four times as much stopping distance at 40 mph as you need at 20
mph
Q11: You are driving on a slippery road during the day. What does the Commercial
Driving Handbook say about how much space you should keep ahead of your truck?
a) Allow "much more space" than is needed for ideal driving conditions
b) Allow "one vehicle length for every 10,000 lbs. of gross vehicles weight
c) Add "one vehicle length for every 10 mph"
a) Allow "much more space" than is needed for ideal driving conditions
Empty or lightly loaded trucks:
a) Require shorter stopping distance than full ones
b) Are the easiest to stop since there is no shifting cargo
c) May have poor traction due to bouncing and wheel lockup
c) May have poor traction due to bouncing and wheel lockup
00:1200:55
Which of these statements is true?
a) For a set of couple doubles or triples, be sure the pintle hook is in the open position
b) For a set of doubles or triples, the fifth wheel should be all the way towards the
tractor
c) When coupling a set of doubles or triples, be sure the pintle-eye of the dolly is in the
proper place
c) When coupling a set of doubles or triples, be sure the pintle-eye of the dolly is in the
proper place
Which of these statement is true about checking your mirrors?
CDL- Combination Vehicles (Doubles and Triples) Page 2 CDL- Combination Vehicles (Doubles and Triples).pdf
, CDL- Combination Vehicles (Doubles and Triples) Page 3 2026-03-29
a) Correct mirror adjustments can only be checked while driving on a roadway with
traffic
b) Checking your mirrors regularly will eliminate all blind spots
c) Use the mirrors to look for tire fires
c) Use the mirrors to look for tire fires
Which of these statements is true about seeing ahead?
a) At highway speeds you should look 3-5 seconds ahead of you
b) Looking too far ahead causes you to miss things close to you
c) Good-drivers shift their attention back and forth, near and far
c) Good-drivers shift their attention back and forth, near and far
Which of the following is the correct position for shut-off valves for a set of doubles or
triples?
a) Open for the rear of the front trailers and closed for the rear of the last trailer
b) Closed for the rear of both trailers and open for the rear of the last trailer
c) Closed for the rear of both the front and the last trailer
a) Open for the rear of the front trailers and closed for the rear of the last trailer
What is likely to happen if the pintle hook is unlocked with the dolly still under the
second trailer?
a) The air lines will rupture
b) The dolly tow bar may fly up
c) Nothing, unless the rig rolls forward
b) The dolly tow bar may fly up
You are driving a set of doubles when a set of trailer wheels starts to skip. Which of the
following is most likely to occur?
a) The rig will continue moving in a straight line
b) The rig will stay in a straight line but slide sideways
c) The trailer will jackknife
c) The trailer will jackknife
When uncoupling the rear semi trailer, you should lower the converter dolly landing
gear:
a) Until it touches the ground
b) Enough to loft the trailer completely off the dolly
c) Enough to remove some of the weight from the dolly
c) Enough to remove some of the weight from the dolly
Which of these statements is true?
a) You need to look farther ahead when driving a straight truck as compared to a set of
doubles or triples
b) Empty rigs are more likely to turn over in a crash than fully loaded rigs
c) A set of doubles or triples must be driven very smoothly to avoid a rollover or
jackknife
CDL- Combination Vehicles (Doubles and Triples) Page 3 CDL- Combination Vehicles (Doubles and Triples).pdf
