Law enforcement regularly uses radar and lidar devices to measure vehicle speed, but they are not always accurate; certain things can impact the reliability of these readings. Should that happen, drivers who believe they were wrongly cited for speeding based on faulty data may have grounds to challenge the ticket in court.
How Do Radar and Lidar Devices Measure Speed?
“Radar” devices measure speed by sending radio waves toward a moving vehicle and calculating the change in frequency when the waves bounce back. “Lidar” devices, on the other hand, use laser beams to measure the time it takes for light to reflect off the vehicle and return to the sensor. Both technologies are widely used but require proper setup, calibration, and operation to produce accurate results.
What Causes Inaccurate Readings?
Weather conditions like heavy rain, fog, or strong winds can interfere with signals. Traffic congestion can also cause false readings when nearby vehicles reflect the signal back. Additionally, device misalignment, outdated calibration, or operator mistakes during setup can all lead to incorrect results.
Can Calibration Records Be Requested in Court?
Yes. Drivers have the right to request maintenance and calibration records for radar and lidar devices used during a traffic stop. If the records show that the device was not calibrated according to state or manufacturer standards, the reading may be considered unreliable. This evidence can be presented to the court to support the defense.
How Does Officer Training Affect Speed Readings?
Law enforcement officers must receive training to properly operate radar and lidar equipment. Inadequate training can lead to setup errors, misinterpretation of readings, or improper aiming of the device. If the officer who issued the citation did not meet required training standards, the court may question the validity of the speed measurement.
Can Environmental Interference Affect Lidar Accuracy?
Yes. Lidar devices are particularly sensitive to environmental interference. Glare from sunlight, reflective surfaces, or large nearby objects can cause distorted readings. If environmental conditions may have affected the device’s accuracy at the time of the stop, this argument can be used to challenge the results in court.
What Role Does Visual Confirmation Play?
Officers are generally trained to visually estimate a vehicle’s speed before confirming it with radar or lidar. If the officer relied solely on the device without first visually observing speeding, that may weaken the reliability of the citation. Challenging the absence of visual confirmation can be a valid defense strategy.
Can a Lawyer Subpoena the Device’s Usage History?
Yes. A lawyer can request detailed logs showing when and how the radar or lidar device was used, including information about prior maintenance and performance checks. If the device has a documented history of inaccurate readings or operational issues, that evidence can be presented in court to dispute the citation.
Is It Possible to Challenge the Officer’s Line of Sight?
Yes. Radar and lidar devices require a clear, unobstructed view of the vehicle to produce an accurate reading. Trees, buildings, passing trucks, or road curves can interfere with the signal and lead to incorrect speed measurements. If the officer’s position at the time of the reading created potential obstructions, the device’s accuracy can be called into question.
What Happens if the Court Finds the Reading Unreliable?
If the judge determines that the radar or lidar reading was unreliable due to calibration issues, operator error, or environmental interference, the speeding charge may be reduced or dismissed entirely. The outcome depends on the strength of the presented evidence and the specific facts of the case.
Our Experienced New Jersey Ticket Lawyers at Ellis Law Help Clients Fight Questionable Speeding Citations
If you need help challenging a speeding ticket, contact our New Jersey ticket lawyers at Ellis Law. For a free consultation, call us today at 732-702-6103 or complete our online form. Located in Freehold, New Jersey, we proudly serve clients throughout New Jersey and New York.
