What is the speed reduction required when passing an emergency vehicle if the speed limit is 25 mph?

The correct choice reflects the legal requirement that drivers must reduce their speed when passing an emergency vehicle that is stopped on the side of the road with its lights activated. In many jurisdictions, this speed reduction is typically specified to ensure the safety of both the emergency personnel and drivers.

When the speed limit is set at 25 mph, a reduction of 15 mph effectively means that drivers should slow down to 10 mph when approaching and passing an emergency vehicle. This considerable decrease is designed to minimize risks, as it allows drivers more time to react to any unexpected movements from emergency responders or other vehicles on the road.

Reducing speed to a lower threshold is crucial in these situations, as the presence of emergency responders often indicates active and potentially hazardous conditions. This legal requirement helps to enhance safety for everyone involved and establishes a clear guideline that drivers must follow to remain compliant with traffic regulations.