Why do they call it rush hour?

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Tags

1. #originally
2. #called
3. #slowest
4. #public
5. #worst
6. #congestion
7. #normally
8. #commuting
9. #happens
10. #traffic
11. #while
12. #roads
13. #twice
14. #people
15. #posted
16. #transport
17. #which
18. #crowding
19. #during