How do stop lights work?

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  1. #vehicles
  2. #detect
  3. #intersection
  4. #vehicle
  5. #system
  6. #traffic
  7. #intelligent
  8. #signals
  9. #rather
  10. #timers
  11. #lights
  12. #present
  13. #allow
  14. #arrives
  15. #sensor
  16. #based
  17. #cycle
  18. #sensors
  19. #smart
  20. #through