What is the purpose of the small lights mounted on the stop arm itself?

Pick an answer

1. To indicate the bus is currently out of service
2. To make the extended stop arm more visible to approaching traffic, especially in low light
3. They are purely decorative and serve no visibility purpose, since the stop arm itself is already bright red
4. To signal only to students, not to other drivers

Correct!

Not quite. The correct answer is highlighted.