What action must an inspector take when a major safety hazard is found on a vehicle?

When a major safety hazard is identified on a vehicle during inspection, the appropriate action is to tag the vehicle as unsafe for operation until repairs are made. This is crucial for ensuring the safety of the occupants of the vehicle as well as other road users. By marking the vehicle as unsafe, the inspector is effectively communicating that operating the vehicle in its current state poses a significant risk, and until the necessary repairs are completed, it should not be driven. This practice helps to uphold safety standards and prevent accidents that may arise from operating a vehicle with serious deficiencies.