During an annual test, how should type A, B, or C governor-operated safeties be tested?

The proper method for testing type A, B, or C governor-operated safeties during an annual test is to conduct the test manually with the car running at the lowest operating speed. This approach allows for a controlled and safer testing environment, where the functionality of the governor-operated safeties can be assessed without the complications or dangers associated with higher speeds.

Testing at the lowest speed is crucial because it ensures the safeties are responsive and operational under conditions that may be more representative of everyday usage where the conditions can vary. By performing the test manually, the technician can closely monitor the activation of the safeties and verify that they function correctly as the car approaches overspeed conditions.

Tests at higher speeds or with a full load could result in safety hazards and complicate the assessment process, while an unloaded condition (as mentioned in some other options) may not provide a realistic scenario to evaluate the safeties' performance effectively.