Page 1 of 42
NSC DEFENSIVE DRIVING 2026/27 COURSE
EXAM COMPLETE (100) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED EXPLANATIONS|GUARANTEED
PASS,
DEFENSIVE DRIVING
Prepare for the NSC Defensive Driving Course Exam with practice
questions covering core principles of the National Safety Council’s
Defensive Driving Course (DDC), including the Smith System, SIPDE,
collision prevention, distracted driving, impaired driving, speed
management, vehicle safety, hazard recognition, and adverse
weather driving. This study resource helps improve driving
awareness and reinforces safe decision-making behind the wheel.
Ideal for individuals completing defensive driving certification or
workplace driving safety programs. Suitable for driver safety and
transportation training.
Multiple choice.
Subsection 1: The Driving Task s Human Factors (Questions
1–15)
1. Approximately how many decisions does the average
driver make per mile?
A) 5 – 10
B) 20 – 30
, Page 2 of 42
C) 40 – 60
D) 100 – 120
Answer: C. 40 – 60
Explanation: The driving task is complex and dynamic. The
average driver makes 40–60 decisions per mile, many of them
split-second judgments about speed, position, and hazards.
2. Which of the following is the most common factor in traffic
collisions?
A) Vehicle mechanical failure
B) Roadway design
C) Driver error (inattention, speeding, impairment)
D) Weather conditions
Answer: C. Driver error (inattention, speeding, impairment)
Explanation: Over 90% of crashes involve human error.
Improving driver behavior is the most effective way to prevent
collisions.
3. The term “highway hypnosis” refers to:
A) Falling asleep at the wheel
B) A trance-like state caused by monotonous driving (reduced
awareness)
C) The effect of bright sunlight on the eyes
D) The use of hypnotherapy for driving anxiety
Answer: B. A trance-like state caused by monotonous driving
(reduced awareness)
Explanation: Highway hypnosis occurs during long, straight,
repetitive driving. The driver remains awake but stops actively
, Page 3 of 42
scanning and reacting. Taking breaks and shifting eye focus
helps prevent it.
4. What is the “two-second rule” used for?
A) Reaction time for braking
B) Minimum following distance under ideal conditions
C) Time to check mirrors
D) Time to signal before a lane change
Answer: B. Minimum following distance under ideal
conditions
Explanation: The two-second rule helps maintain a safe
following distance. Pick a fixed object; when the vehicle ahead
passes it, you should reach it no sooner than two seconds later.
5. Which of the following is NOT a component of the SIPDE
defensive driving system?
A) Search
B) Identify
C) Predict
D) Accelerate
Answer: D. Accelerate
Explanation: SIPDE stands for Search, Identify, Predict, Decide,
and Execute. It is a systematic approach to hazard recognition
and avoidance.
6. The average reaction time for a driver seeing a hazard and
beginning to brake is about:
A) 0.1 – 0.3 seconds
B) 0.5 – 0.75 seconds
, Page 4 of 42
C) 0.75 – 1.5 seconds
D) 2 – 3 seconds
Answer: C. 0.75 – 1.5 seconds
Explanation: Reaction time varies but is typically ¾ to 1½
seconds. At 60 mph, a vehicle travels about 88 feet per second,
so in 1 second it travels 88 feet before braking even begins.
7. The “Smith System” of defensive driving includes which of
the following key principles?
A) Aim high in steering
B) Keep your eyes moving
C) Leave yourself an out
D) All of the above
Answer: D. All of the above
Explanation: The Smith System includes five principles: Aim
high in steering, Get the big picture, Keep your eyes moving,
Leave yourself an out, and Make sure they see you.
8. Which sense is most critical for safe driving?
A) Hearing
B) Touch
C) Vision
D) Smell
Answer: C. Vision
Explanation: Approximately 90% of the information needed for
driving comes through the eyes. Good vision and proper
scanning are essential.
NSC DEFENSIVE DRIVING 2026/27 COURSE
EXAM COMPLETE (100) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED EXPLANATIONS|GUARANTEED
PASS,
DEFENSIVE DRIVING
Prepare for the NSC Defensive Driving Course Exam with practice
questions covering core principles of the National Safety Council’s
Defensive Driving Course (DDC), including the Smith System, SIPDE,
collision prevention, distracted driving, impaired driving, speed
management, vehicle safety, hazard recognition, and adverse
weather driving. This study resource helps improve driving
awareness and reinforces safe decision-making behind the wheel.
Ideal for individuals completing defensive driving certification or
workplace driving safety programs. Suitable for driver safety and
transportation training.
Multiple choice.
Subsection 1: The Driving Task s Human Factors (Questions
1–15)
1. Approximately how many decisions does the average
driver make per mile?
A) 5 – 10
B) 20 – 30
, Page 2 of 42
C) 40 – 60
D) 100 – 120
Answer: C. 40 – 60
Explanation: The driving task is complex and dynamic. The
average driver makes 40–60 decisions per mile, many of them
split-second judgments about speed, position, and hazards.
2. Which of the following is the most common factor in traffic
collisions?
A) Vehicle mechanical failure
B) Roadway design
C) Driver error (inattention, speeding, impairment)
D) Weather conditions
Answer: C. Driver error (inattention, speeding, impairment)
Explanation: Over 90% of crashes involve human error.
Improving driver behavior is the most effective way to prevent
collisions.
3. The term “highway hypnosis” refers to:
A) Falling asleep at the wheel
B) A trance-like state caused by monotonous driving (reduced
awareness)
C) The effect of bright sunlight on the eyes
D) The use of hypnotherapy for driving anxiety
Answer: B. A trance-like state caused by monotonous driving
(reduced awareness)
Explanation: Highway hypnosis occurs during long, straight,
repetitive driving. The driver remains awake but stops actively
, Page 3 of 42
scanning and reacting. Taking breaks and shifting eye focus
helps prevent it.
4. What is the “two-second rule” used for?
A) Reaction time for braking
B) Minimum following distance under ideal conditions
C) Time to check mirrors
D) Time to signal before a lane change
Answer: B. Minimum following distance under ideal
conditions
Explanation: The two-second rule helps maintain a safe
following distance. Pick a fixed object; when the vehicle ahead
passes it, you should reach it no sooner than two seconds later.
5. Which of the following is NOT a component of the SIPDE
defensive driving system?
A) Search
B) Identify
C) Predict
D) Accelerate
Answer: D. Accelerate
Explanation: SIPDE stands for Search, Identify, Predict, Decide,
and Execute. It is a systematic approach to hazard recognition
and avoidance.
6. The average reaction time for a driver seeing a hazard and
beginning to brake is about:
A) 0.1 – 0.3 seconds
B) 0.5 – 0.75 seconds
, Page 4 of 42
C) 0.75 – 1.5 seconds
D) 2 – 3 seconds
Answer: C. 0.75 – 1.5 seconds
Explanation: Reaction time varies but is typically ¾ to 1½
seconds. At 60 mph, a vehicle travels about 88 feet per second,
so in 1 second it travels 88 feet before braking even begins.
7. The “Smith System” of defensive driving includes which of
the following key principles?
A) Aim high in steering
B) Keep your eyes moving
C) Leave yourself an out
D) All of the above
Answer: D. All of the above
Explanation: The Smith System includes five principles: Aim
high in steering, Get the big picture, Keep your eyes moving,
Leave yourself an out, and Make sure they see you.
8. Which sense is most critical for safe driving?
A) Hearing
B) Touch
C) Vision
D) Smell
Answer: C. Vision
Explanation: Approximately 90% of the information needed for
driving comes through the eyes. Good vision and proper
scanning are essential.
