Which factor can contribute to increased stopping distances for emergency vehicles?

Wet or icy road conditions significantly contribute to increased stopping distances for emergency vehicles due to the reduced traction that these conditions create. When road surfaces are wet or covered in ice, the friction between the tires and the road decreases, which means that it takes longer for a vehicle to come to a complete stop. This is critical for emergency vehicles, as they often operate at high speeds and need to respond quickly to situations while ensuring the safety of both their personnel and the public.

In contrast, utilizing sirens, following speed limits, and operating with lights activated do not inherently increase stopping distances; they may help in alerting the public or ensuring legal compliance, but they do not affect the vehicle's braking performance in the same way that compromised road conditions do. Therefore, recognizing weather-related factors is essential for safe driving and effective emergency response.