What does the black and yellow striped sign mean?

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Tags

1. #looking
2. #obstruction
3. #bridge
4. #should
5. #without
6. #black
7. #yellow
8. #abutment
9. #immediately
10. #warns
11. #stripes
12. #ahead
13. #alternating
14. #other
15. #appears
16. #anything
17. #indicates
18. #rectangle
19. #intrusion
20. #roadway
21. #slanting