What is the limitation of using a siren at higher speeds?

• A. More effective in getting attention
• B. Less effective at higher speeds and around obstacles
• C. Terminates the pursuit
• D. Increases the risk of accidents

Answer: (B)

Using a siren at higher speeds can be less effective, particularly when navigating through areas with obstacles such as buildings or trees. The effectiveness of sound diminishes as speed increases due to the Doppler effect, which alters the pitch and direction from which sound waves reach bystanders. Additionally, at high speeds, the siren may not be heard by individuals who are farther away or focused on other sounds, such as traffic noise. Therefore, while the intention is to alert other road users, its impact can be significantly reduced under these conditions. This limitation is crucial for emergency responses, as it can affect safety and the ability to navigate through traffic effectively.