How often should radar equipment be tested using a tuning fork?

The correct answer is based on the critical importance of ensuring that radar equipment is functioning accurately at all times. Testing radar equipment with a tuning fork before and after each shift or while on duty helps to verify that the device is reporting speeds correctly, which is crucial for enforcing speed limits and maintaining safety on the road.

Regular testing minimizes the risk of errors that could result from malfunctioning equipment, ensuring that operators can rely on the readings they obtain during their shifts. By conducting these tests routinely, operators can identify and address any issues with the radar equipment proactively, maintaining the integrity of speed enforcement efforts.

The other options suggest less frequent testing, which may not be sufficient to ensure the equipment's ongoing accuracy throughout different shifts or operational conditions. Relying solely on testing after a fault is reported risks periods during which faulty readings could affect enforcement actions, potentially leading to legal complications or public safety concerns.