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Safe Driving Free CDL Practice Tests
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Prepare For The Safe Driving Portion Of Your CDL Written Exams

Safe Driving Questions

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By law, who is ultimately responsible for ensuring the safety and road-worthiness of a CMV?
  • The mechanic
  • The driver
  • The DOT
  • The trucking company
Click here to look up the answer

From The CDL Manual

The most important aspect of traffic safety for yourself and others who share the road with you is that you personally inspect your vehicle. A vehicle defect found during an inspection could save you problems later. You could have a breakdown on the road that will cost you time and money, or even worse, an accident caused by the defect.

Federal and state laws require that drivers inspect their vehicles. Federal and state inspectors also may inspect your vehicles. If they judge a vehicle to be unsafe, they will put it “out of service” until it is repaired.

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When should drivers inspect their vehicles?
  • After the trip
  • Pre-trip
  • Drivers should do all of these things.
  • During the trip
Click here to look up the answer

From The CDL Manual

Pre-trip Inspection — A pre-trip inspection will help you find problems that could cause an accident or breakdown.

Trip Inspection — For safety you should:

  • Watch gauges for signs of trouble.
  • Use your senses to check for problems (look, listen, smell, feel).
  • Check critical items when you stop:
    • - Tires, wheels and rims
    • - Brakes
    • - Lights and reflectors
    • - Brake and electrical connections to trailer
    • - Trailer coupling devices
    • - Cargo securement devices

After-Trip Inspection and Report — Conduct an after-trip inspection at the end of the trip, day or tour of duty on each vehicle you operate. This may include completing a vehicle condition report listing any problems you find. The inspection report helps the motor carrier know when the vehicle needs repairs.

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Next
What is the minimum allowable tread depth for every groove on the front tires?
  • 5/8
  • 2/32
  • 4/32
  • 3/8
Click here to look up the answer

From The CDL Manual

Bad wear. You need at least 4/32-inch tread depth in every major groove on front wheels and 2/32-inch depth on other tires. No fabric should show through the tread or sidewall.

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Next
Rust around wheel nuts may indicate what?
  • Insufficient tread
  • Low air pressure
  • Loose nuts
  • Out-of-alignment
Click here to look up the answer

From The CDL Manual

Shiny threads or rust around wheel nuts may mean the nuts are loose–check tightness. After a tire has been changed, stop a short while later and re-check tightness of nuts.

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Next
All of the following are key parts of the steering system except:
  • Steering wheel
  • Horn pressure plate
  • Steering gear box
  • Tie rod
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From The CDL Manual

See figure 2-1 "Steering System Key Parts"

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Next
A major safety concern of a broken or faulty exhaust system is:
  • Poor fuel mileage
  • Pieces of the exhaust breaking off
  • Having a loud exhaust
  • Poisonous fumes leaking into the cab or berth
Click here to look up the answer

From The CDL Manual

Exhaust system: A broken exhaust system can let poisonous fumes into the cab or sleeper berth.

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Next
Vehicles should be equipped with all of the following emergency equipment except:
  • Fire extinguisher(s)
  • Spare electrical fuses
  • Flashing blue lights
  • Warning devices for parked vehicles
Click here to look up the answer

From The CDL Manual

Emergency Equipment — Vehicles should be equipped with the following emergency equipment:

  • Fire extinguisher(s)
  • Spare electrical fuses (unless equipped with circuit breakers)
  • Warning devices for parked vehicles (e.g., three reflective warning triangles)
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Next
Specific suspension problems that drivers should look for include which of the following:
  • These are all potential suspension problems that drivers should look for
  • Leaking shock absorbers
  • Broken leaves in a multi-leaf spring, or leaves that have shifted so they might hit a tire or other part
  • Any loose, cracked, broken or missing frame members
Click here to look up the answer

From The CDL Manual

Suspension systems: The suspension system holds up the vehicle and its load and keeps the axles in place.

Therefore, broken suspension parts can be extremely dangerous. Look for the following:

  • Spring hangers (Figure 2-2) that allow movement of axle from proper position.
  • Cracked or broken spring hangers.
  • Missing or broken leaves in any leaf spring. If 1/4 or more are missing, it will put the vehicle “out of service,” but any defect can be dangerous (Figure 2-3).
  • Broken leaves in a multi-leaf spring, or leaves that have shifted so they might hit a tire or other part.
  • Leaking shock absorbers (Figure 2-4).
  • Torque rod or arm, U-bolts, spring hangers, or other axle positioning parts that are cracked, damaged or missing (Figure 2-2).
  • Air suspension systems that are damaged and/or leaking (Figure 2-4).
  • Any loose, cracked, broken or missing frame members.
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Retreaded, recapped, or regrooved tires are allowed on the front wheels of a bus when?
  • When it will not be carrying children
  • When that's the only thing available
  • Never
  • Only for city driving
Click here to look up the answer

From The CDL Manual

Regrooved, recapped or retreaded tires on the front wheels of a bus are prohibited.

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Circumstances that would make wheels and rims unsafe include the following except:
  • Missing studs, lugs, clamps, or spacers
  • Rims or wheels that have been welded
  • Cracked, mismatched, or bent lock rings
  • These are all issues that should be inspected and repaired
Click here to look up the answer

From The CDL Manual

Wheels and rims:

  • Damaged rims.
  • Shiny threads or rust around wheel nuts may mean the nuts are loose–check tightness. After a tire has been changed, stop a short while later and re-check tightness of nuts.
  • Missing clamps, spacers, studs or lugs means danger.
  • Mismatched, bent or cracked lock rings are dangerous.
  • Wheels or rims that have had welding repairs are not safe.
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