Siren tones should be changed from wail to another tone at least 200 feet before entering the intersection or approaching vehicles from a distance.

• A. True
• B. False
• C. It depends on traffic
• D. Not recommended

Answer: (A)

Changing to a more attention-getting siren tone before you enter an intersection or reach approaching traffic gives drivers a clearer warning window. Wail is a longer, slower signal that can fade into ambient noise at distance, so switching to a higher-pitched or faster tone early—about 200 feet out—helps others notice you sooner and react safely. The 200-foot cue provides a practical, repeatable point to begin the transition, improving safety as you approach crossings. While traffic conditions matter, the purpose of the switch is to ensure warning is conveyed well before you reach the intersection, which is why this practice is considered correct.