How does the city decide where to install traffic signals?
Traffic signals are usually warranted based on minimum traffic volumes during eight hours of a typical weekday. These minimum volumes, or “warrants,” vary depending on the speed of the roadway and the number of approach lanes. For a signal to be approved, it needs to meet the necessary warrants and be justified. To be considered “justified,” factors such as access and distance to nearby signals, lane geometry, and future road plans are all taken into account. If all the necessary conditions are satisfied, and funding is available, a signal may be installed.

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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?