What aspect of ambulance performance can affect overtaking?

The aspect of ambulance performance that can affect overtaking is primarily related to speed capabilities. When responding to emergencies, ambulances need to maneuver effectively and rapidly in traffic, especially when they encounter situations that require overtaking other vehicles to reach their destinations quickly and safely. The speed at which an ambulance can travel directly influences its ability to overtake slower-moving vehicles, allowing it to reduce response times in critical situations.

Although other factors such as color, size, and the type of siren are important for visibility and communication of urgency to other road users, they do not directly impact the ambulance's ability to overtake. The driver’s license type is also less relevant in this context, as long as the driver is qualified to operate the ambulance; it is the performance characteristics of the vehicle, particularly its speed, that play a vital role in overtaking maneuvers.