#1
What is the maximum allowable blood alcohol concentration (BAC) for commercial drivers in most jurisdictions?
0.02%
ExplanationLegal limit for BAC in commercial drivers to ensure safety.
#2
What is the primary function of a weigh station on highways for commercial vehicles?
To check and enforce weight limits
ExplanationEnsures compliance with weight regulations for safety.
#3
What is the purpose of a 'Jake brake' (engine compression release brake) in commercial vehicles?
To assist with downhill speed control
ExplanationControls vehicle speed on descents to prevent runaway situations.
#4
What does the term 'bobtailing' mean in the context of commercial driving?
Operating a vehicle without a trailer attached
ExplanationDriving a truck without the weight and stability of a trailer.
#5
What is the purpose of a 're-entry ramp' on highways in the context of commercial driving?
To allow vehicles to merge back onto the highway
ExplanationSafety feature for vehicles re-entering highways from rest areas or exits.
#6
In the context of commercial driving, what does the term 'Hours of Service' refer to?
Maximum time a driver is allowed to be on duty
ExplanationLimits on driving time to prevent fatigue-related accidents.
#7
What is the purpose of an Anti-lock Braking System (ABS) in commercial vehicles?
To prevent wheel lockup during braking
ExplanationPrevents skidding and maintains control during braking.
#8
What does the term 'blind spot' refer to in the context of commercial driving?
An area not visible to the driver through mirrors
ExplanationUnseen area around the vehicle posing risks for lane changes.
#9
Which of the following is a common cause of commercial vehicle rollovers?
Excessive speeding
ExplanationHigh speeds leading to loss of vehicle control and rollovers.
#10
In the context of commercial driving, what does the term 'bobtail' mean?
A trailer with no cargo
ExplanationTruck without a trailer attached, affecting handling and braking.
#11
What is the purpose of a 'black box' or Electronic Logging Device (ELD) in commercial vehicles?
To monitor and record driving hours
ExplanationTracks driver activity and ensures compliance with regulations.
#12
What is the recommended following distance for commercial vehicles traveling at highway speeds?
3 seconds
ExplanationSafe distance to maintain for reaction time and stopping distance.
#13
What is the purpose of a 'CDL' in the context of commercial driving?
Commercial Driver's License
ExplanationRequired license to operate commercial vehicles legally.
#14
What is the purpose of a 'pre-trip inspection' for commercial drivers?
To check the vehicle's condition before starting a trip
ExplanationEnsures vehicle safety and prevents breakdowns during trips.
#15
What is the significance of a 'tanker endorsement' on a commercial driver's license?
Authorizes the driver to transport liquid cargo
ExplanationRequired endorsement for transporting specific cargo types.
#16
What is the recommended procedure for a commercial driver when approaching a railroad crossing?
Stop and check for approaching trains
ExplanationSafety measure to prevent accidents at railroad crossings.
#17
What is the purpose of a 'no-zone' in relation to commercial vehicles?
Blind spots around a commercial vehicle
ExplanationAreas around the truck where the driver's vision is limited.