Which method is NOT used to ascertain a violator's speed?

The correct answer is based on the understanding that brake light assessment is not a recognized or effective method for measuring a driver's speed. Radar, pacing, and LIDAR are all established techniques used by law enforcement to determine how fast a vehicle is traveling.

Radar and LIDAR utilize technology to measure the speed of a moving vehicle accurately. These devices send out signals and measure the time it takes for them to return after bouncing off the vehicle, allowing officers to calculate the speed with precision. Pacing involves an officer driving a patrol vehicle at a consistent speed alongside or behind the violator and comparing speeds to determine whether the other vehicle is exceeding the limit.

In contrast, assessing brake lights does not provide any information about the speed of a vehicle. While brake lights can indicate that a driver is slowing down or stopping, they cannot be used to quantitatively measure speed. Therefore, brake light assessment is not a valid or reliable method for determining a violator's speed compared to the other methods listed.