In an ambulance emergency, you could use red flashing overhead lights and not the siren when:

• A. There is little to no traffic in the streets
• B. You do not want to frighten other motorists and possibly cause an accident
• C. You have received complaints from the public about excessive noise
• D. Never. You are required by law to always use the siren during an emergency

Answer: (D)

The key idea is that audible warnings are an essential part of an ambulance’s emergency response. The siren is what helps other road users hear and understand that something urgent is happening, prompting them to yield and clear a path even if they don’t notice the lights right away. Because of this, you’re expected to use the siren every time you respond to an emergency. Relying only on red flashing lights won’t meet the legal requirement and can slow response or create unsafe situations. Even if traffic is light or there are complaints about noise, the priority is a timely and safe arrival, and the siren is the standard practice to achieve that.