What is base in road construction?

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Tags

1. #layer
2. #pavements
3. #riding
4. #subgrade
5. #course
6. #arena
7. #above
8. #field
9. #material
10. #track
11. #roadway
12. #directly
13. #built
14. #otherwise
15. #constructed
16. #there
17. #asphalt
18. #sporting
19. #basecourse