What is one criterion for determining if a driver exercised due regard for the safety of others?

Sufficient notice of the ambulance's approach is a fundamental criterion for determining if a driver exercised due regard for the safety of others. When an ambulance is in transit to an emergency, it is crucial for the driver to alert other road users of its presence. Providing sufficient notice typically involves using lights and sirens, as well as driving in a manner that ensures other drivers and pedestrians are aware of the approaching emergency vehicle.

This awareness allows others to yield the right-of-way, ensuring the ambulance can navigate through traffic safely and effectively. When drivers are not given adequate warning, they may react unpredictably or fail to yield, which can lead to accidents and jeopardize the safety of both the ambulance crew and the public.

In contrast, other options, such as speeding above the limit or using the siren at all times, do not inherently demonstrate due regard for safety. Speeding may be dangerous regardless of the context, and while using the siren is a standard practice, it does not negate the responsibility to drive safely. Driving above a specific speed limit, like 55 mph, may also be considered reckless depending on the conditions of the road, traffic density, and other factors that could affect the safety of all road users.