CDL COMBINATION VEHICLE PRACTICE
TEST ACTUAL EXAM PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
⩥ Chocking the wheels. Answer: If the trailer lacks spring brakes, you
must chock the wheels whenever you park to prevent rolling.
⩥ Trailer hand brake. Answer: You should not use the trailer hand brake
to straighten out a jackknifing trailer because it can worsen the skid.
⩥ Fifth wheel unlocking. Answer: To unlock the fifth wheel, pull the
tractor forward until the fifth wheel is out from under the trailer but the
tractor frame is still under the trailer.
⩥ Crack-the-whip rollover. Answer: A tractor pulling three trailers has
the greatest chance of a 'crack-the-whip' rollover.
⩥ Trailer hand valve. Answer: The trailer hand valve controls only the
trailer brakes, not the tractor brakes.
⩥ Triple trailer rollover risk. Answer: The last trailer of a triple is 3.5
times more likely to roll over than a five-axle tractor.
, ⩥ Air lines crossing. Answer: If you cross the air lines when hooking up
to an old trailer without spring brakes, you will be able to drive away but
won't have trailer brakes.
⩥ Shut-off valve in doubles. Answer: When driving a set of doubles, the
shut-off valve must be closed in the last trailer at the back.
⩥ Spring brakes requirement. Answer: Trailers built before 1975 are not
required to have spring brakes.
⩥ Testing trailer air brakes. Answer: Always test the trailer air brakes
before you start to drive.
⩥ Trailer skid detection. Answer: The best way to tell if your trailer has
started to skid is to see it in your mirrors.
⩥ Jackknifing trailer. Answer: The earliest way to notice that your trailer
is jackknifing is to see it swinging out in your mirrors.
⩥ Truck driver deaths. Answer: More than half of all truck driver deaths
are the result of rollovers.
TEST ACTUAL EXAM PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
⩥ Chocking the wheels. Answer: If the trailer lacks spring brakes, you
must chock the wheels whenever you park to prevent rolling.
⩥ Trailer hand brake. Answer: You should not use the trailer hand brake
to straighten out a jackknifing trailer because it can worsen the skid.
⩥ Fifth wheel unlocking. Answer: To unlock the fifth wheel, pull the
tractor forward until the fifth wheel is out from under the trailer but the
tractor frame is still under the trailer.
⩥ Crack-the-whip rollover. Answer: A tractor pulling three trailers has
the greatest chance of a 'crack-the-whip' rollover.
⩥ Trailer hand valve. Answer: The trailer hand valve controls only the
trailer brakes, not the tractor brakes.
⩥ Triple trailer rollover risk. Answer: The last trailer of a triple is 3.5
times more likely to roll over than a five-axle tractor.
, ⩥ Air lines crossing. Answer: If you cross the air lines when hooking up
to an old trailer without spring brakes, you will be able to drive away but
won't have trailer brakes.
⩥ Shut-off valve in doubles. Answer: When driving a set of doubles, the
shut-off valve must be closed in the last trailer at the back.
⩥ Spring brakes requirement. Answer: Trailers built before 1975 are not
required to have spring brakes.
⩥ Testing trailer air brakes. Answer: Always test the trailer air brakes
before you start to drive.
⩥ Trailer skid detection. Answer: The best way to tell if your trailer has
started to skid is to see it in your mirrors.
⩥ Jackknifing trailer. Answer: The earliest way to notice that your trailer
is jackknifing is to see it swinging out in your mirrors.
⩥ Truck driver deaths. Answer: More than half of all truck driver deaths
are the result of rollovers.
