When driving a bus, how should the emergency roof hatches be handled?

The correct handling of emergency roof hatches on a bus is that they may be locked in a partially open position for fresh air. This method allows for ventilation while also maintaining safety during transit. Emergency roof hatches are designed to provide an escape route in case of an emergency, and having them slightly open can help regulate temperature and improve airflow inside the bus, ensuring optimal passenger comfort.

However, it's crucial that these hatches are not left fully open while the bus is in motion, as this could pose a safety risk (potentially affecting the bus's aerodynamics or allowing debris inside). Keeping them completely closed and locked while the bus is moving ensures that passengers and the driver are safe from the external environment and any potential hazards. Thus, locking them in a partially open position balances safety and comfort efficiently.