Why do we think Yield signs are yellow?

Related questions

1. What is yield percentage?
2. Which is the best method of growing rice?
3. Are yield signs red?
4. Will not yield meaning?
5. What is an upside down yield sign?
6. Who yields at a merge?
7. Is high or low yield better?
8. What is the difference between yield and merge?
9. Can you grow white rice?
10. How much does a rice farmer make?

Tags

1. #today
2. #often
3. #yellow
4. #seeing
5. #yield
6. #because
7. #still
8. #think
9. #problem
10. #middle
11. #white
12. #things
13. #represents
14. #color
15. #signs
16. #outside
17. #reason