At what speed does the effectiveness of a siren go down?

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Multiple Choice

At what speed does the effectiveness of a siren go down?

Explanation:
The warning value of a siren is tied to how far and how clearly it can be heard over road and wind noise as you move. As speed increases, sound energy is spread out more quickly and background noise makes it harder for people to notice and react to the siren. This reduction in audibility becomes noticeable around 50 mph, and it drops even more at higher speeds. So 50 mph is the point where the siren’s effectiveness begins to decrease, making it the best answer.

The warning value of a siren is tied to how far and how clearly it can be heard over road and wind noise as you move. As speed increases, sound energy is spread out more quickly and background noise makes it harder for people to notice and react to the siren. This reduction in audibility becomes noticeable around 50 mph, and it drops even more at higher speeds. So 50 mph is the point where the siren’s effectiveness begins to decrease, making it the best answer.

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