CDL Subsections 2.15-2.16 Exam Questions & Answers.
1. What factors determine your selection of a "safe" speed when going down a long, steep downgrade? - CORRECT ANSWER Your most important consideration is to select a speed that is not too fast for the: Total weight of the vehicle and cargo. L...
1. What factors determine your selection of a "safe" speed when going down a long, steep downgrade? -
CORRECT ANSWER Your most important consideration is to select a speed that is not too fast for the:
Total weight of the vehicle and cargo. Length of the grade. Steepness of the grade. Road conditions.
Weather.
2. Why should you be in the proper gear before starting down a hill? - CORRECT ANSWER Do not try to
downshift after your speed has already built up. You will not be able to shift into a lower gear. You may
not even be able to get back into any gear and all engine braking effect will be lost. Forcing an automatic
transmission into a lower gear at high speed could damage the transmission and also lead to loss of all
engine braking effect.
3. Describe the proper braking technique when going down a long, steep downgrade. - CORRECT
ANSWER The use of brakes on a long and/or steep downgrade is only a supplement to the braking effect
of the engine. Once the vehicle is in the proper low gear, the following are the proper braking
techniques: Apply the brakes just hard enough to feel a definite slowdown. When your speed has been
reduced to approximately five mph below your "safe" speed, release the brakes. (This brake application
should last for about three seconds.) When your speed has increased to your "safe" speed, repeat steps
1 and 2. For example, if your "safe" speed is 40 mph, you would not apply the brakes until your speed
reaches 40 mph. You now apply the brakes hard enough to gradually reduce your speed to 35 mph and
then release the brakes. Repeat this as often as necessary until you have reached the end of the
downgrade.
4. What type of vehicles can get stuck on a railroad-highway crossing? - CORRECT ANSWER Be Aware!
These trailers can get stuck on raised crossings: Low slung units (lowboy, car carrier, moving van,
possum-belly livestock trailer). Single-axle tractor pulling a long trailer with its landing gear set to
accommodate a tandem-axle tractor.
5. How long does it take for a typical tractortrailer unit to clear a double track? - CORRECT ANSWER It
takes a typical tractortrailer unit at least 14 seconds to clear a single track and more than 15 seconds to
clear a double track.
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