Why are street signs yellow?

Related questions

1. What is the down arrow symbol called?
2. What do arrowheads symbolize?
3. What does the black and yellow striped sign mean?
4. What is the difference between trend and forecast in Excel?
5. What does a blue sign signify?
6. What does the feather mean in infinity tattoo?
7. What do Chevron tattoos mean?
8. How do I change the color of my conditional formatting icon?
9. What does an arrow pointing down mean?
10. What does the sign with a car and squiggly lines mean?

Tags

1. #reduce
2. #portion
3. #driving
4. #necessary
5. #yellow
6. #general
7. #zones
8. #warning
9. #safety
10. #signifies
11. #speed
12. #posted
13. #slower
14. #construction
15. #signs
16. #maintenance
17. #unless
18. #minimum
19. #illegal
20. #slowing
21. #highway
22. #stand
23. #traffic
24. #legally
25. #limit
26. #caution
27. #speeds