1158 SPEED MEASUREMENT COURSE (FDLE) EXAM] QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027.
Section One: Questions 1–100
Which element is essential for a valid speed measurement citation?
A. The officer's subjective opinion alone
B. Calibration logs for the device
C. A witness present in the vehicle
D. The weather forecast for the day
🟢 B. Calibration logs for the device
🔴 RATIONALE: Documented calibration logs are legally required to ensure the accuracy and
reliability of the speed measurement device used in court.
What is the primary purpose of the Doppler shift principle in radar?
A. Measuring the distance between two objects
B. Calculating the frequency change of reflected waves
C. Adjusting for ambient temperature
D. Scanning the license plate of a vehicle
🟢 B. Calculating the frequency change of reflected waves
🔴 RATIONALE: Radar operates by measuring the difference in frequency between transmitted
and reflected waves caused by the motion of the target vehicle.
When testing a radar device, what is a "tuning fork" used for?
A. Determining the speed limit of the road
B. Calibrating the radar’s internal distance sensor
C. Verifying the accuracy of the speed reading
D. Cleaning the antenna lens
,🟢 C. Verifying the accuracy of the speed reading
🔴 RATIONALE: Tuning forks are precision-engineered to vibrate at a specific frequency, providing
a reliable external reference to check radar calibration.
If a radar unit is experiencing "batching," what is occurring?
A. The device is measuring multiple vehicles simultaneously
B. The unit is failing to lock onto a single target
C. The radar is picking up interference from power lines
D. The officer is recording too many tickets
🟢 B. The unit is failing to lock onto a single target
🔴 RATIONALE: Batching occurs when the radar processor cannot distinguish between individual
targets, often resulting in inaccurate speed readings.
What is the cosine effect in speed measurement?
A. An increase in the measured speed of a target
B. A decrease in the measured speed of a target
C. The tendency of radar to pick up stationary objects
D. A malfunction in the display unit
🟢 B. A decrease in the measured speed of a target
🔴 RATIONALE: The cosine effect occurs when the radar beam is not perfectly aligned with the
target's path, causing the device to measure a component of the speed rather than the true speed.
Which factor is most likely to cause radio frequency interference (RFI) in a radar unit?
A. A high-voltage power line
B. Heavy rainfall
C. The color of the target vehicle
D. The age of the police vehicle's tires
,🟢 A. A high-voltage power line
🔴 RATIONALE: Radar units detect electromagnetic waves; external sources of electromagnetic
energy, such as power lines, can interfere with signal reception.
What does the term "tracking history" refer to in speed enforcement?
A. The officer's log of all tickets issued
B. The process of observing, measuring, and confirming a target
C. The automatic storage of radar data on a server
D. A history of the vehicle's past traffic violations
🟢 B. The process of observing, measuring, and confirming a target
🔴 RATIONALE: Tracking history is the foundational procedure of visual observation, audio
confirmation, and display verification necessary to ensure a specific vehicle is being clocked.
In stationary radar operation, where should the antenna be pointed to minimize the cosine effect?
A. Directly at the center of the roadway
B. At a 45-degree angle to the lane
C. Parallel to the lane of traffic
D. Toward the sky
🟢 C. Parallel to the lane of traffic
🔴 RATIONALE: Minimizing the angle between the radar beam and the target's path is essential to
ensure the most accurate speed reading, as the cosine effect always works in favor of the motorist
(resulting in a lower reading).
When using LIDAR, what does the "range" function determine?
A. The speed of the vehicle
B. The distance from the device to the target
C. The height of the vehicle
, D. The brightness of the vehicle’s headlights
🟢 B. The distance from the vehicle to the target
🔴 RATIONALE: LIDAR uses pulses of light to measure the time it takes for the light to bounce
back, providing a highly accurate distance measurement.
What is the primary difference between RADAR and LIDAR?
A. LIDAR uses light pulses, while RADAR uses radio waves
B. RADAR is more accurate at close range
C. LIDAR is only used for stationary vehicles
D. RADAR does not require calibration
🟢 A. LIDAR uses light pulses, while RADAR uses radio waves
🔴 RATIONALE: The fundamental difference lies in the medium used; LIDAR (Light Detection and
Ranging) utilizes laser light, whereas RADAR (Radio Detection and Ranging) uses radio
frequencies.
What is the "panning" effect?
A. A rapid movement of the radar antenna
B. The unit picking up the speed of the patrol car
C. A type of software update
D. The process of saving a video file
🟢 A. A rapid movement of the radar antenna
🔴 RATIONALE: Panning occurs when the radar antenna is moved rapidly, causing the internal
circuitry to register a false speed reading based on the movement of the antenna itself.
Which of the following is an example of an internal test for a radar unit?
A. Using a tuning fork
B. Activating the "test" switch on the control panel
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027.
Section One: Questions 1–100
Which element is essential for a valid speed measurement citation?
A. The officer's subjective opinion alone
B. Calibration logs for the device
C. A witness present in the vehicle
D. The weather forecast for the day
🟢 B. Calibration logs for the device
🔴 RATIONALE: Documented calibration logs are legally required to ensure the accuracy and
reliability of the speed measurement device used in court.
What is the primary purpose of the Doppler shift principle in radar?
A. Measuring the distance between two objects
B. Calculating the frequency change of reflected waves
C. Adjusting for ambient temperature
D. Scanning the license plate of a vehicle
🟢 B. Calculating the frequency change of reflected waves
🔴 RATIONALE: Radar operates by measuring the difference in frequency between transmitted
and reflected waves caused by the motion of the target vehicle.
When testing a radar device, what is a "tuning fork" used for?
A. Determining the speed limit of the road
B. Calibrating the radar’s internal distance sensor
C. Verifying the accuracy of the speed reading
D. Cleaning the antenna lens
,🟢 C. Verifying the accuracy of the speed reading
🔴 RATIONALE: Tuning forks are precision-engineered to vibrate at a specific frequency, providing
a reliable external reference to check radar calibration.
If a radar unit is experiencing "batching," what is occurring?
A. The device is measuring multiple vehicles simultaneously
B. The unit is failing to lock onto a single target
C. The radar is picking up interference from power lines
D. The officer is recording too many tickets
🟢 B. The unit is failing to lock onto a single target
🔴 RATIONALE: Batching occurs when the radar processor cannot distinguish between individual
targets, often resulting in inaccurate speed readings.
What is the cosine effect in speed measurement?
A. An increase in the measured speed of a target
B. A decrease in the measured speed of a target
C. The tendency of radar to pick up stationary objects
D. A malfunction in the display unit
🟢 B. A decrease in the measured speed of a target
🔴 RATIONALE: The cosine effect occurs when the radar beam is not perfectly aligned with the
target's path, causing the device to measure a component of the speed rather than the true speed.
Which factor is most likely to cause radio frequency interference (RFI) in a radar unit?
A. A high-voltage power line
B. Heavy rainfall
C. The color of the target vehicle
D. The age of the police vehicle's tires
,🟢 A. A high-voltage power line
🔴 RATIONALE: Radar units detect electromagnetic waves; external sources of electromagnetic
energy, such as power lines, can interfere with signal reception.
What does the term "tracking history" refer to in speed enforcement?
A. The officer's log of all tickets issued
B. The process of observing, measuring, and confirming a target
C. The automatic storage of radar data on a server
D. A history of the vehicle's past traffic violations
🟢 B. The process of observing, measuring, and confirming a target
🔴 RATIONALE: Tracking history is the foundational procedure of visual observation, audio
confirmation, and display verification necessary to ensure a specific vehicle is being clocked.
In stationary radar operation, where should the antenna be pointed to minimize the cosine effect?
A. Directly at the center of the roadway
B. At a 45-degree angle to the lane
C. Parallel to the lane of traffic
D. Toward the sky
🟢 C. Parallel to the lane of traffic
🔴 RATIONALE: Minimizing the angle between the radar beam and the target's path is essential to
ensure the most accurate speed reading, as the cosine effect always works in favor of the motorist
(resulting in a lower reading).
When using LIDAR, what does the "range" function determine?
A. The speed of the vehicle
B. The distance from the device to the target
C. The height of the vehicle
, D. The brightness of the vehicle’s headlights
🟢 B. The distance from the vehicle to the target
🔴 RATIONALE: LIDAR uses pulses of light to measure the time it takes for the light to bounce
back, providing a highly accurate distance measurement.
What is the primary difference between RADAR and LIDAR?
A. LIDAR uses light pulses, while RADAR uses radio waves
B. RADAR is more accurate at close range
C. LIDAR is only used for stationary vehicles
D. RADAR does not require calibration
🟢 A. LIDAR uses light pulses, while RADAR uses radio waves
🔴 RATIONALE: The fundamental difference lies in the medium used; LIDAR (Light Detection and
Ranging) utilizes laser light, whereas RADAR (Radio Detection and Ranging) uses radio
frequencies.
What is the "panning" effect?
A. A rapid movement of the radar antenna
B. The unit picking up the speed of the patrol car
C. A type of software update
D. The process of saving a video file
🟢 A. A rapid movement of the radar antenna
🔴 RATIONALE: Panning occurs when the radar antenna is moved rapidly, causing the internal
circuitry to register a false speed reading based on the movement of the antenna itself.
Which of the following is an example of an internal test for a radar unit?
A. Using a tuning fork
B. Activating the "test" switch on the control panel
