What must bus emergency exits have?

Bus emergency exits must have clearly marked exit signs to ensure passengers can quickly identify and access these exits in case of an emergency. Proper signage is crucial for passenger safety, as it reduces confusion and speeds up evacuation during critical situations. The signs must be visible and placed strategically so that everyone aboard can easily find them, even under stressful conditions or in low visibility situations.

While other options might seem relevant to bus safety features, they do not hold the importance of clearly marked exit signs for emergency situations. For instance, security cameras can contribute to safety but do not aid in immediate evacuation. Similarly, disabling window locks or restricting door operation methods address other safety considerations but do not ensure that passengers can find and use emergency exits effectively.