Why don’t we allow more left turns on a green ball indication?
Alabama Department of Transportation and City of Dothan can require that left turns be “protected” (green arrow only) when either there are dual left turn lanes, turning volumes are high, the posted speed limit is high, sight lines are restricted, there is pattern of left turning vehicle collisions, or when there is a combination of these factors. Relaxing the policy would reduce wait time at traffic signals and save fuel, but would also likely cause an increase in severe crashes.

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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?