Why do some signals have a separate protected green arrow phase for left turns?

Left turn signals are implemented when opposing through traffic does not permit adequate time for a vehicle to safely make the left turn maneuver. They allow for dedicated time for left turning vehicles, reducing the likelihood of collision with oncoming traffic. 

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1. How can I report a pothole?
2. Who do I contact to discuss a signal timing problem I have observed?
3. How do I report a traffic signal that is dark, flashing, or has damaged equipment?
4. How do I request a traffic signal be installed at an intersection?
5. How does the Town of Mount Pleasant decide to install a traffic signal?
6. What is the purpose of a traffic signal?
7. What are the basics of traffic signal timing?
8. Does a traffic signal control speed?
9. Why speeding on US 17 doesn’t pay – An explanation of the Town’s adaptive traffic control system.
10. Does the Town collect video footage from cameras located at traffic signals?
11. Will a traffic signal reduce intersection crashes?
12. Why do some signals have a separate protected green arrow phase for left turns?
13. How does the Town consider requests for a separate protected green arrow phase for left turns?
14. When is a right turn lane or left turn lane justified?
15. What does a flashing yellow arrow mean?
16. What does a flashing yellow ball mean?
17. What does a flashing red ball mean?
18. Why does the signal sometimes skip a phase?
19. How do I get my private road accepted for public maintenance?
20. When will my street be repaved?
21. How do I report broken/fallen street signs?
22. How can my neighborhood request traffic calming devices such as speed humps?
23. How can I determine if my street is owned/maintained by the Town?
24. Do I need a permit from the Town to replace/repair my driveway?
25. Who do I call to request a street light?
26. Where can I find information on Transportation Impact Fees?
27. Are the traffic signals synchronized?