What does the sign with a car and squiggly lines mean?

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Tags

1. #become
2. #behind
3. #turned
4. #likely
5. #exception
6. #engaged
7. #assist
8. #system
9. #illuminated
10. #flashing
11. #lines
12. #underneath
13. #means
14. #would
15. #symbol
16. #program
17. #written
18. #indicates
19. #stability
20. #vehicle
21. #which
22. #squiggly