How often should speed measurement devices be calibrated in South Carolina?

• A. Every month
• B. At least once every twelve months or after significant changes
• C. Only when a new device is purchased
• D. Every two years

Answer: (B)

The appropriate frequency for calibrating speed measurement devices in South Carolina is at least once every twelve months or after significant changes. This measure ensures that the devices maintain their accuracy and reliability, which is critical for enforcing speed limits and upholding traffic laws. Regular calibration addresses any potential drift in measurement that can occur over time or due to environmental factors, thus ensuring the results are consistently valid.

Calibrating only when a new device is purchased or after a longer span, such as every two years, could lead to gaps in accuracy and potentially unjust penalties if the devices provide false readings. The requirement to calibrate after significant changes—such as a change in the device’s location or after maintenance—is also crucial in maintaining the integrity of the readings.