View instructions
Drivers who want to drive combination vehicles must pass the combination vehicles test. The Idaho CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Idaho CDL Manual. Take this practice test now to prepare for the actual ID CDL combination test!
1. Rollovers happen when drivers:
turn too fast.
brake too hard.
turn too slowly.
2. If a load is 50 feet long, the minimum number of tie-downs required is:
3. If your trailer starts to skid, you should:
pump the brakes.
release the brakes.
steer in the opposite direction.
4. The proper following distance for a 60-foot vehicle traveling at 50 mph is:
6 seconds
7 seconds
4 seconds
5. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
4 seconds
3 seconds
2 seconds
6. What is countersteering?
Staying off the brake while steering to the right to avoid an accident.
Turning the steering wheel quickly the other way after steering in an emergency situation.
Locking your wheels while turning in an emergency situation.
7. When you get ready to back under the semi-trailer, you should:
line up about 15 degrees off the line of the trailer.
line up directly in front of the trailer.
back under the trailer at an angle to avoid pushing the trailer sideways.
8. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
the locking jaws are around the head of the kingpin.
the end of the kingpin is even with the top of the fifth wheel.
it will be raised slightly when the tractor is backed under it.
9. Loose cargo:
could hurt or kill you during a quick stop.
can be a danger to others and yourself.
All of the above.
10. When you drive a tractor-trailer combination with ABS, you should:
brake as you always have.
pump the brakes.
apply the trailer hand brake whe braking.
Page 1 of 2
Next page

ID CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Share This Online CDL Test
Rate this CDL Combination Test
5 out of 5
based on 392 votes