Why don’t we put in more left turn arrows at signalized intersections?
Left turn signal phases facilitate left turning traffic and usually improve the safety of the intersection for left turning vehicles. However, this is done at the expense of the amount of green time available for through traffic and will usually reduce the capacity of the intersection. Left turn arrows also result in longer cycle lengths (if in coordination), which will in turn have a detrimental effect by increasing stops and delays.

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1. What if there is a problem with a traffic signal?
2. How does the city decide where to install traffic signals?
3. Will a traffic signal reduce crashes at an intersection?
4. What should drivers do when the traffic signal is all dark?
5. Why do some traffic signals take so long to change?
6. Why are traffic signals synchronized on some streets and not on others?
7. Why don’t we allow more left turns on a green ball indication?
8. Why don’t we put in more left turn arrows at signalized intersections?
9. Why isn't there enough green time at a traffic signal to get the traffic through all approaches?
10. Why aren't traffic signals put in flashing operation late at night?
11. What do the symbols at a pedestrian countdown signal mean?