What are the three types of signs?

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Tags

1. #message
2. #guide
3. #signs
4. #warning
5. #categories
6. #regulatory
7. #visibility
8. #important
9. #about
10. #communicates
11. #shape
12. #information
13. #conditions
14. #traffic
15. #heavy
16. #basic
17. #three
18. #divided