TX CDL Combination Practice Test (2024)

1. If your brakes get wet, it can cause them:

2. When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.

3. You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.

4. If a load is 10 feet long, the minimum number of tie-downs required is:

5. A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.

6. When inspecting the cargo, make sure it is:

piled up.
not overloaded.
secured properly for the first 50 miles after beginning a trip.
All of the above.

7. Headlights:

should not be used when driving at night.
can blind other drivers.
should be out of adjustment.
must be turned on a half hour before sunset to a half hour after sunrise.

8. You have uncoupled a trailer and want to inspect the landing gear. The tractor should be positioned:

with the tractor frame under the trailer.
completely clear of the trailer.
with the tractor frame above the trailer.
None of the above.

9. If you get stuck on the railroad tracks, the first thing you should do is:

immediately get out of the cab and move away from the tracks.
try to move your vehicle until you see the train.
stay in your vehicle and call 911.
scream for help.

10. To test the service brake:

gently try to pull forward with the trailer parking brake on, then release the brake.
push the brake pedal firmly while going about 5 mph.
push the brake pedal firmly while slowly moving backward.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.

CDL COMBINATION PRACTICE TEST (TX)