Which of the following devices is NOT commonly used for speed measurement in South Carolina?

• A. Radar guns
• B. Lidar devices
• C. Speed cameras
• D. Traffic cones

Answer: (D)

Traffic cones do not measure speed; instead, they are physical barriers used to direct and manage traffic flow. In contrast, radar guns, lidar devices, and speed cameras are electronic devices specifically designed to determine the speed of moving vehicles. Radar guns utilize radio waves to detect speed, while lidar devices use laser technology for more precise measurements. Speed cameras capture images of vehicles exceeding speed limits, often equipped with speed detection capabilities. Therefore, the correct option indicates a non-speed measurement tool, distinguishing it from the other choices, which are established methods for speed enforcement.