CDL Full Practice Test Part 17

1. You are approaching a construction zone on a four-lane highway. Work vehicles are present on the right shoulder, and workers are active near the roadway. Visibility is clear. What communication method should you use to alert workers and other drivers of your presence?

2. A driver needs to couple a tractor to a semitrailer. Place the following coupling steps in the correct sequence:

1. Position tractor in front of trailer
2. Connect air lines to trailer
3. Supply air to trailer and test trailer brakes
4. Back tractor under trailer until fifth wheel jaws lock
5. Check coupling security (tug test)
6. Connect electrical cord to trailer
7. Inspect fifth wheel and trailer kingpin area

What is the correct order for these coupling steps?

3. How far ahead should a commercial motor vehicle driver look to maintain proper visual search while driving at highway speed?

4. What is the correct procedure for a driver to log into an ELD before beginning a driving shift?

5. During a walk-around exterior inspection, a driver notices that one of the rear drive axle’s spring leaves is cracked halfway through its width. The spring is still attached and the axle appears to be sitting at normal height. The driver’s next destination is a repair shop 50 miles away. What is the correct decision regarding this defect?

6. A driver is descending a 5% mountain grade in rainy conditions with a loaded tractor-semitrailer. The driver applies the brakes firmly to slow from 45 MPH to 35 MPH, and the tractor immediately begins to skid with the trailer swinging to the right. The driver releases the brakes and counter-steers, but the trailer continues swinging until the combination reaches a full jackknife position. Which factor most likely initiated this jackknife sequence?

7. A driver builds air pressure to 130 PSI, but the pressure continues rising. What component has most likely failed?

8. During the CDL skills test, you are performing straight-line backing. You notice the trailer is drifting toward the right boundary line. What corrective action should you take FIRST?

9. A driver enters a construction zone posted at 45 mph while operating a loaded tractor-semitrailer. Workers are present near the roadway, and lane width is reduced. Traffic ahead is moving at approximately 35 mph. What speed should the driver maintain, and why?

10. A driver approaching a railroad-highway grade crossing with multiple tracks notices flashing lights and an approaching train on the nearest track. The driver stops at the required distance (15–50 feet) and waits. The train passes on the nearest track. The driver begins to proceed across the crossing without additional observation. What critical error has the driver made, and what should the correct procedure be?